The one reason that I that think the Boeing design is probably superior is that the booster stages appear to be use identical airframes. Although they'd probably have to use different engine nozzles, TPS, et cetera, the inclusion of *any* commonality between components would make development and servicing that much easier. The LM proposal, by contrast, seems designed to minimize any potential commonalities between components, and, presumably, maximize the number of needed subcontractors in important congressional districts. The Lockheed-Martin management is *very* aware that this is the game that they're playing, and it worked damned well for them with the X-33. So I fear that they'll walk away with the prize yet again. :-(

Of course, I wouldn't especially opt for the Boeing design either. Like Larry, I think the Northrop/OSC proposal has the most merit, from what I've seen.

Cheers,

Nathan.