As @BigAl says, he's played a few for Watford now, so he'll be looking at a higher level than us given his length of contract.
I think we have to be going for a left sided player too, it's fairly important at the level of player we're going to be looking at. Macdonald's error at the weekend came because of him not being able to confidently stride forward on his wrong foot. We've seen Gartenmann be a little shakey when he played there too. Pollock's strong suit isn't his ability on the ball, so you'd never want to play him wrong side, similarly Rubezic. We've put our eggs in the Rubezic basket for now, I don't see us getting a similar player in on big wages. People will say that the left/right foot thing shouldn't matter in professional football, but it definitely does. It's basically giving a player a handicap unnecessarily, so you'd have to sign someone who's, say, 10% better than a natural left footer just to remain equal. We've got a blank slate to sign someone, so we can afford to be picky. I really hope we're not going with Jensen for next season.