I would have recommended CSM simply because of the variety, but since you dont want those....
I say go for Vanilla C:SM. Not because they are better than BAs, but because they are better at teaching you to use MeQs. Having shootier Tac Squads, dedicated assault units like TH/SS termies, etc means that they tend to force more tactical play from your part, compared to the BAs. It tends to be easier to move from codex marines to the more specialized chapters than the other way, and you'll be the better player for it.
Plus, in 6th codex marines got a bit of a boost, with their relative cheaper shootyness, and the boost to 2+ armor with their already cheap TH termies.
|