When the QH was walking, was he limping slightly? Showed no signs of pain in trot. A few times canter looked like it's front legs were always cantering but back legs trotting sometimes and vice versa? That happens when the rider doesn't know how to properly collect the horse, which might not look to good in the ring...
The paint looks good =]
But it comes down to your expirence level, and price range. If you can handle the paint, then buy him, and still have more money left over. I would test ride them both first, then see =]
Lettin' the cat outta the bag is a whole lot easier than puttin' it back. -- Unkown