Marvin & Andersons (if top of line) are good windows. You might want to look at Sears windows. I am a rep. for Sears Home Improvement and I'm not saying this because I sell them, but they are exclusive to Sears and of excellent quality and high energy efficient and manufactured to Sears specifications. They are all rated by "Energy Star" (N.F.R.C.) with a U-Factor of 32 which is by far better then most windows you will find in the marketplace. They also carry a lifetime product warranty, backed 100% by Sears, which also includes glass breakage & Sears years famous "Customer Satisfaction guarantee or money back Guarantee" policy. If I can personally be of any help to you, that is if you live in the S.E. Michigan or Northern Ohio area, please give me call at (248) 935-5159 or e-mail me. Or if you live elsewhere, call (800) 222-5030 and follow the prompts.