mtbound10,
May I recommend trying out Ascend speakers? They are ID, and if you don't like em, send em back. This is coming from a pretty decent fan of BW speakers.
I woundn't worry too much about mismatched surrounds. If this is HT mainly, I would barely worry about it. Just make sure that the front three are matched.
And, I'm sorry to finally say this to you, as I've read the same misspelling by 100's of others before saying this, but it is spelled "bass", and not "base". Thank you.