I think my favorite out of those is this one: Big Bodied and Good Looking 4 YO Gelding - Price Reduced!
However he went from $2500 to $500, I'm not sure why..
I would definitely seek the advice of a trainer or vet to take a look at whatever I decide. I am definitely taking my time deciding, though. I don't want to do anything on impulse, because I have been known to do that... lol
I think my top three right now are the bay mare, the chestnut mare, and that chestnut gelding.