I'd set your 30" to the native 2560x1600 (as mschey already mentioned), if I were you, and leave it there unless there's some incredibly compelling reason not to. Right now, at 1920x1080, you're using only 50% of its optimal resolution and total screen RE. (Besides, your aspect ratio is off, 1.78 instead of 1.60.) Think of it as driving a Viper on 5 cylinders... it's still kinda fun, but, hey, come on...
Lol ... doesn't sound very fun to me, but ... Yeah, I'd recommend running at native res as well. I've never seen an LCD that looks good at a non-native resolution. Certain people where I work have 20" widescreens running at 800x600 (yes, obviously wrong aspect ratio for widescreen), while I'm stuck with a 17" @ 1280x1024. Whenever I go to their PCs, I change the res while I'm working on it so as to not hurt my eyes from the blockiness.
I bought them mostly from searching on Froogle.com for the ergotron part numbers. StockzTrader was the one who put it together first and figured out which parts are needed. Big hat off to him for giving us the blueprint. http://www.elitetrader.com/vb/showthread.php?s=&threadid=43661&perpage=6&pagenumber=255
Anyone know the name of the screwdriver I need to take off the monitor stand on the dell 30"? they look funny.