In this area I would say Simonton, Gorell, some Great Lakes models would be your best value. I honestly have never seen a PGT window so I can't say for sure how they hold up over time.
If you're looking for a proven track record for in this area, then the three I mentioned may be worth a little more money upfront...rather than taking a chance on something a little cheaper that you may have to replace again in a few years. Trust me...we replace inexpensive "replacement" windows all the time.
