Anderson & Pella are both very good, established brands. They’re a little pricier than the in-store brands at Lowes and Home Depot.
Depending on your weather, wood-framed (Pella) are very nice but require a lot of maintenance to keep that wood sealed.
Vinyl-clad frames are low-maintenance, but stick with the white vinyl and avoid colored (brown).
The in-store brands at Home Depot and generally good quality double-paned, cost lots less than Anderson & Pella, and work well for common window sizes. From what I understand stay away from argon-gas-filled double-pane windows unless you’re in an extremely cold environment. Otherwise the argon-filled is an unnecessary expense.
Actually, Lowes sells Pella brand windows. We replaced all our single pane windows here in San Antonio, resulting in a savings of at least 30% on our heating and cooling bills.
The best thing about Lowes is that you can finance them at 0% up to 24 months (sometimes even 30mos), which makes the stress on your finances a little more bearable!