There's no reason to post this, other than that I thought it would be interesting. Even I don't know what I'll find. Here are the most successful Astros, drafted by the Astros, sorted by round (by bWAR). Let's get after it:
Note: Players denoted with a * did not acquire any WAR with the Astros. Players had to have signed with the Astros initially in order to be considered (hence the absence of Michael Bourn).
Also: There were 96 Rounds of the 1990, 1991, and 1994 drafts. There were 98 Rounds in 1990 and 1994, and 99 Rounds in 1990.