If I were HOU, I would want to try to get another solid OF to replace Beltran and Berkman since he's going to be questionable at least at the start of the year. I think Maggs would be a good fit, but I don't see that happening. There is a kid in the minors ready to take over 2B isn't there? Or am I thinking of someone else? If not, they need to get a good 2B to replace Kent of course. Other than that maybe pick up a bench guy who is a Chone Figgins type who can play multiple positions well since there is so much uncertainty at this point. Oh and hope Clemens comes back and Pettite's elbow is back to what it was with the Yankees.
You are thinking about Burke, the second base prospect. And yeah he should be ready and will be given a shot.
I think they need to find out if Ensberg is for real or not...if he's not, just make the decision and trade him and bring in a good 3b. They have the bench role player Figgins type already....Vizcaino. Everett at SS, Burke at 2B, ??? at 3B, Bags at 1B. Their infield isn't great, but it's good enough to win with the pitching staff they have, if they can stay healthy.
Their season will come down to whether or not Wade Miller and Roy Oswalt can stay healthy. I would also HIGHLY suggest investing in a quality setup man. Lidge can't handle the load by himself for a whole season IMO.