Subwoofers

I sold the first sub I ever owned, a Rel Strata III with the intent to upgrade, but now finding it difficult to decide what to buy. Given my system, GMA Europa Max speakers, and my orientation is for 2 channel audio, what should I buy? I am torn between the Rel Britannia B3 or the Martin Logan Depth. Are the Vandersteen 2wq subs as good as people say? Am I just being snobby towards them due to their inexpensive price?

Thanks.