We had Martin Aluminum enclose our 9 x 20 lanai in March of 2009. We used acrylic. We had three quotes and Martin's was the best.
I wasn't sure I'd like the lanai enclosed but I am so glad we did. I love it.
I was like you in wanting the largest panes possible. I learned in going through the quote process that unless you tell them they spec it out with more narrow panels rather than few wider panels. It's obviously easier on the installers because they don't weigh as much. On our 20' section we have three sections (6 total panels) just a bit over three feet each. I've seen some homes that have four or five sections (8 or 10 panels) in about the same space. Make sure you tell them what you want.
Hope this info helps.
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