I also buy all of mine from Midwest Supplies. They have never let me down. After I made my first batch and my friends thought it tasted great I pretty much became a lifetime customer.
Keep an eye on the promotional kits from Austin Homebrew. I ordered the Karakanawa Pale Ale out of curiosity a few weeks ago and am enjoying it now. It is easily my best homebrew yet! (I've done about 25 or so batches), and the least I have paid for a kit.
I order pretty much exclusively from AHS. Done a few kits from morebeer and was not impressed. But then again those were also the first ones I did so it is more likely my fault then the kits.