I would recommend the Evic VTC Mini, as I own one, and enjoy it very much so. I can also recommend the Kanger Subox mini kit, complete with Subtank mini (1-of the more popular sub-ohm tanks on the market) The Subtank mini kit can be had for well under $60.

If you are NOT into rebuilding, you can find the Subox NANO kit for $40 right now. (This "NANO" kit comes w/the same mod as the regular Subox kit, however, the NANO tank that comes in the kit does-not come with a rebuildable coil-head) The Subox NANO mod would be great & very low-cost, if you would-like to try 1-of the most popular tanks of today, & you dont rebuild.
If you do-not like the looks of the Evic Mini or the Subox by Kanger, I can definitely recommend the IPVD2, which is probably the MOST popular mod of late 2015. Everyone who's any1 has got one. These have a high wattage limit, and they seem to be built well, with good software inside. They're popular 4 a reason. Next on the list would-be the IPVD3, right? Plenty of people have this mod, as-well, and it's a well-built mod w/high w limit.
Next, I would recommend you have a look around. I mean, don't limit urself to our suggestions. There are plenty of mod choices out there right now. TOO MANY choices, to listen to people in a thread on a forum!! TRUST me, there may be a mod that speaks to you FAR MORE than anything we suggest.
For instance- There are bottom-fed mods (Like the REO) for less than 35-40 bucks, on Fasttech/other china sites. Are ya kidding me? If you haven't tried Bottom-feeding, this may-be your chance! and trust me when I say that bottom-fed mods are my faaavorite type of mod. It's dripping without having to drip, my friend.

& the bottom-fed mods I speak of, on FT, come with a bottom-feed capable RDA in the below 40 dollar price-tag. I mean, ya really can't beat that. They're even pulling-in good reviews.
If Bottom-Fed Mods aren't for you, what-about a side-mounted tank mod? Have you seen these yet? There are plenty on the market... These mods allow you to screw the tank down adjacent to the mod, rather than on-top. This makes for an extremely SHORT mod. They fit in the palm of your hand! You can vape from them out in public (in-front of the grocery store, in-front of the mall, IN the mall- haha) & no1 will even SEE the mod. All that's visible is the little drip-tip poking up from between your fist! These side-mount tank mods R truly sexy.. I would LOVE one, if I had the dough to buy one.
There's also regulated tube mods. The Provari is only 75 bucks these days. IDK if you know anything about this mod, but it's basically the best-built mod you can buy, period. & it comes with 1yr warranty and the ability to send it in for repair, for the LIFE of the mod (or the life of the owner, lol) You cannot go wrong with the Provari. If it were to break, like what happened w/your Coolfire4, well-then, you could just send it in. (of-course, you would have-to purchase a set of AW 18650 batteries, and an 18650 battery charger (a total of around $25 in-addition to the $75 Provari itself, but, well-worth the price in terms of quality + warranty!)
For under $70 you have too many great options for me to list here... Check websites such-as: VaporBeast, VaporBank, VaporDNA, MyVaporStore (the last is my favorite site to order-from) and Fasttech. When searching thru Fasttech, use keywords like "Regulated Mod" if you want to look at electronic mods. Use keywords like "bottomfed" for BF mods. There's plenty of mods to choose-from on all 5 of these sites. I'm not even going to list any-more. Simply google "regulated mod e-cigarette" & you'll find plenty of US-sites.

Good luck with your search for a new mod, and after this little hiccup, please ENJOY your vape journey!!
PS- I recommend googling "Your State + Vape Shop" to see if there's a shop selling mods in ur area... IDK what you're planning to do until you get that new mod, but I think I speak for everyone when I say: DON'T think-about using that Coolfire4 until you receive the new mod.... Dude, if that battery vents with that mod up-to your face, you could very-well wind-up losing a tooth. You could wind-up choking on a drip-tip, and if it's stainless-steel & you swallow it, it may wind-up causing issues in your GI-Tract. Not good. It could wind-up burning your palm/fist. It could even burn-down your home while on the charger. Esp if it is getting HOT while on that charger.

PLEASE reconsider using that mod any-longer, and NEXT-DAY ship a NEW ONE! Better-yet, try to find a vape shop in your area, go there, and have them HELP YOU! I can see no better scenario than you heading to a vape-shop to be HELPED by the (hopefully) caring individuals whom work there... Please bro, do what you can to get a new mod ASAP and please don't use that thing.
Have a good one.