I've been on the site for about 3 years now. It didn't take long from just reading to learn that the following have quite a reputation on here. I haven't had a saw ported yet, but plan to -- I'll be using Randy because I was going to use Brad based on his strong presence here and myriad of videos / instruction, but Brad only does new saws and I've got a 20+ year old 262XP (my avatar) I want to make the best it can be.
I can't see how you could go wrong with:
Wicked Work Saw (Terry)
Mastermind (Randy)
Snellerized (Brad Snelling)
Tree Monkey
Tree Slinger
Simonizer
In the past I've seen Stumpy (stumpbroke saws), I'm going to see about having nmurph fix a blown 346 since he's a 346 wizard (Neal pictures coming soon once I pull muffler)... you just have to read the forum for a while and you will learn a TON.
If you read the whole Simonizer thread, he got a lot of challenging questions from people on here and came through in the end with proving what he can do by porting a saw for free labor or whatever.
Simon is in Canada (northwest near Vancouver?) might be easier to stay domestic with shipping and customs etc.
If it helps I believe Randy is friends with the owner of weedeaterman.com which is a sponsor on this site also. See the "about us" page and it says Mastermind is the guy on the right. Do I have this right guys? That's Randy Evans?
I guess what I'm trying to say is there's a lot more than just a website to the "presence" of these guys who have a ton of reputation on this forum.
Good luck -- I'm sure you will end up with a great setup when you engage one of the builders on here with the knowhow to create a kickin and reliable setup. Hope your 660 comes out anywhere near as good as this one