If your room temp is only 60 I think that you'll need a UTH as well. The RHP will create a hotspot just fine for you, but I don't think it would raise the ambient temps from 60 up to 78-80ish. An RHP is my GTP's only heat source, but again, my room temp is already about 72-74 so it only has to raise the cage's ambient temps by 4-6 degrees - not 20. You might think about bumping up your room temps if it's possible.....
Yes, Helix are very good, and I use and recommend the ones from Reptile Basics. Rich is great to talk to about stuff like this too - he was a BIG help to me.