I assume you mean 1600 x 1200 which IS a big monitor. SOME 19" monitors and most 21" monitors supprt it, but smaller ones typically do not. Laptops with larger screens also have this resolution.
Personally, I think the 4 table window is enough for me, but if you can handle 6 at a time more power to you.....just DO NOT hold up the game playing more tables than you can keep track of as this ruins the game (and hurts the site if it is widespread) for everyone.
cheers