Of new tubes I like TADs. I've also used EIs, but they seem to have greater fluctuation in tone. The TAD are bright, open, and offer a good balance between cleans and crunch. They don't crunch too early.
Any one with a good rating. I purchased mine through eBay from Europe and they arrived fast and safe. I really think you'll love them. They're robust military grade tubes designed to withstand 10,000 hours and are made of materials that aren't available now. These ROCK.