I have some titanium drip tips from DV, they look great and they don't get hot when I chain vape:
DiscountVapers.com - Search Results for "titanium"
The above is a link to DV with the search query "titanium." If that happens to expire just go to Discountvapers.com and put titanium in the search box. Eric at DV is very active here on ECF, is reputable, and ships FAST.
Delrin is another option. I got a couple universals from Cherry Vape. By Universal they mean it will hold all your 510 drip tips, or you can use it alone as a short wide driptip. Unlike the above titanium tips, the universals will add another stack or layer to your drip tip solution. Which means they will show. Universals come in black and white. You can find them here:
Drip Tips | Universal |306 | 510 | Cherry Vape
There is also a mini universal:
Drip Tips | Universal |306 | 510 | Cherry Vape
And for alltime fun crazy cool vapes there is the king ming. Here is a link to just one of them (I have this one myself):
Cupid | King | Ming | Drip | Tip | E-Cigarettes | Cherry Vape | CherryVape.com
The other solutions advised - all delrin tips and using longer drip tips like the pipe tips are very good advice. You can also get glass drip tips which will usually have very good o-rings to protect the glass. This seems to provide an adequate level of insulation to prevent burnt lip syndrome.
Let us know what solution you end up choosing and how it works out!