Boy, Dave, your eyes must be alot different than mine. While I'd love a nice big sports finder, which doesn't exist in DSLRs yet, and I couldn't afford if it did, I'd much rather have a big LCD than a tiny viewfinder.
As long as the LAG for the LCD itself is VERY short, the autofocus is fast, and the final shutter release is short.
Even the sony p100 has better focus and MUCH faster final shutter release, than any of the canon, nikon, or oly digis. It's final shutter release time is 11 milliseconds. Won't get fish tails that way! This is much faster than the 100 milliseconds for the d100, or the 124 for the d70.
All the sonys in the last year have had killer AF and shutter lag times. Check imaging-resource.com, for accurate timings.
The 828 is a big monster - might as well have a DSLR, by the time you get through housing it. But it has great AF and shutter lag.
The V3, looks like better specs than the 828, in a small, reasonable zoom package. Includes raw, manual exposure, aperature and shutter priority, etc.
The 8400, with the non-ttl external strobe sensor, and external Auto Focus range sensor, is likely to be problematic, in a housing. Too bad, cause otherwise it looks great!
Don