It's not a large-format box, but I've been very happy with it. It was substantially cheaper than a comparable HP when I got it, but the prices may be closer now. I think it has excellent print quality and the Win drivers have a lot of nice options.
Hmm. It looks like the [link|http://www.lexmark.com/US/products/tech_specs/0,1231,MTk3Nnwx,00.html|W820n] might be reasonable for you - up to 45 ppm, 11x17, PS3, 156 PS fonts, support for a zillion OSes, etc., etc. I can't comment on it though. They've got cheaper 11x17 boxes too, like the [link|http://www.lexmark.com/US/products/overview/0,1224,MzM2M3wx,00.html|W812 ]for $1200 list.
HTH. GL!
Cheers,
Scott.