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IMO for 0.30u/shgc The Prism Platinum is your best choice. The platinum has the stepped sill design, 3/4" coil balance, weld relief on interior of sash. Prism is available from Norandex, the identical 5500 is available at other outlets; big orange and supply houses. I prefer to upgrade to the one inch glass package with super spacer. Mutiple units factory mulled. Great service too. triple pane is also available in their 9800.
Gorell is a nice product; 3/4" coil balance, intercept spacer and triple pane is available. Gorell's white is more of an off white color.
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