Have you thought about this one?
The Beachtek DXA-10?
http://taperssection.com/index.php?topic=55071 (has a pictorial of my setup as well)
It's a cheaper and smaller, runs on DC power
but you WILL need some type of remote power to go more than 1 hour phantom (I haven't done any testing with just a 9V w/ PP). Maybe a lithium 9V would go more than 1 hour PP but like I said, I haven't done any testing. It's been real good to my AT853s (SP PP mod).
Gain and PP, what else do you need?
Nothing fancy but it does the trick and I have had none of the problems I had with the Boost Box (bass, brickwalling,etc).
It's not in the same league as the others but worth a consideration.
Here's the Beachtek link:
http://beachtek.com/dxa10.htmlIt's on BH Photo for around $260. You will need a custom battery connection to replace the 9v battery carriage but it can easily be done (so I have been told
)