I purchased a linksys 2port w/ cables about a year ago for $88 or so. Cables it came w/ were high quality and basically would have cost me as much for just the cables as it did for the switch+cables. (So be careful when you buy the cheap switches somewhere, you still need good cables-- maybe post a link to that $9 set refered to above--would be cool!)
As for performance, No problems with display, refresh, etc. I have it attached to a Hitachi 19" CM751 and looks fine (can't tell the difference between connected to switch and direct to video card). I only go to 1024x768 @ 85Hz, but, even tests at higher res / Ref were ok (just too much for my comfort).
Only drawback with the linksys is the ergonomics... it has 3 sides that cables plug into (Back, Left, and Right). So, no where to put it that it doesn't get in the way. I usually have it sitting on top of a PC, but, it still looks kludgy.