They are all reputable companies and I'm sure you'll get a good alt from any of them. There's always a bad alt here and there for all of these companies, but I believe they all do whatever they can to resolve a situation. DC has some customer service issues as of late, so it's difficult to get in touch with them for anything but from what I've seen they def have some of the best alts. I will personally be going with Excessive Amperage as he's been the most help when looking for info through my research. He's a one man show so when you call/email, you speak with the owner, the same guy that took your order, built it, and shipped it. I see that as a positive. If you're looking for the most power for your money though, I'd look into the others. Mechman has been the talk recently. Great power, good prices, and good CS from what I've heard.