I recently had a large aluminum slider replaced in my kitchen, along with a 8'x8' sliding patio door (one side fixed the other side slid) and used Sherwood Gregory at Custom Windows of Houston ( 713)864-2747. They did a real nice job for the price. He will talk quite a lot, but his price is great and the end product is good. He uses Milguard windows sometimes, which you can find through other sources as well. For the patio door, his custom fabricated door was about $2500 cheaper than the quote I got from Western Window Systems. The Milguard windows are considered the lower end of the spectrum as compared with Fleetwood, Western, etc. but I have been very happy with the one we had installed. It is about 5' tall by 6' wide. It has very thin brushed aluminum framing, which is the look I was going for. Hope this helps.