Flexwatt imo. You can also order Flukers UTH which is basically flexwatt also. Also there is Ultratherm which is good and along the same lines. I like Zoo Med products for the most part but i would skip their UTH as its sticky and basically a heating wire element sandwiched between cushiony plastic.

For T-stat, I'm pretty biased as I've only used Herpstats and they have all worked great. Had multiple Herpstat 1, 2 and 6 and they all worked awesome. They arent cheap but they have lots of safeties and considering a t-stat is one of the most important items, it's well worth spending more on a quality unit. There is also Vivarium Electronics which are cheaper but dont have as many safeties and bells and whistles as a herpstat i dont think.