Let me throw in my $0.02 as well. As mentioned above, there's a whole thread dedicated to BCMA Engines elsewhere, in which I've posted many comments. However, short version:

Adam (blackbaron), the owner of BCMA, is a terrific guy to work with. Great service, reasonable policies, and high level of response and availability.

I own his SPE 40 with a C&H ignition. Price is unbeatable, reliability is high, good performance.

In short, I don't think you'll regret an SPE 26 at ALL.