Hello board. I'm looking to replace all of my windows. I have a picture window that I would like to replace with a 30 degree angle bay window. Double sliding doors, Kitchen casement window, and 13 awning windows. I would like input on a really good quality window with specific specs. I went to a dealer and was told the price of the Marvin windows and Pella windows are the same but that the Marvin was a more quality product. The Marvin also has the aluminum exterior as opposed to the Pella vinyl. Please any input and how much would you say if I purchased on my own and installed as opposed to paying someone to do it? Thanks all and I'll be looking forward to your replys,Tom.