I'm not sure my input will mean a whole lot, as I am rooted, running CM7 nightlies, and overclocking. But here it is...
I am currently using ADW EX (the pay version). I runs more smoothly at a given clock setting than the free ADW version, plus adds some nice additional animations. I like the options for ADW's dockbar better than LP or Go. LP and Go do offer folders in the app drawer I think, which I would like to have...but I get by with ADWs multi-screen setup.
Really it comes down to how you want to set things up, and what works for you...I suggest giving each one a try for a few days, then deciding - all your choices are free, so give them all a shot.