There's a long thread in RFD on windows, it's mostly info pertaining to window companies back east though. I've decided to go with West Coast Windows, primarily b/c I know of a couple people that used them a few years ago and they are very happy with their new windows. I've been to their house and the install job looked really good, but then what do I know.
Of course you may be thinking that they are new windows, of course they would be happy, but the fact of the matter is I know of someone who cheaped out (don't remember the name of the company but I do recall seeing their ad in the mailouts that we get from time to time) and their windows started leaking within a year after installation.
I also got quotes from Centra, A-Plus, LongLife Vinyltek, Home Depot, Starline, and one other. West Coast actually has the best warranty of them all (after reading all the fine prints). It helps that they had a 15% off anniversary special too. I seriously considered Centra and LongLife as well. Centra's ratings CSA rating weren't as high and LongLife would've cost about 30-40% more, which I couldn't justify.
Good luck on your search.