Sounds pretty cool. Probably will be great for viewing, but definitely need a ladder to get into the tank for maintainence. Hope you have long arms too.
You must have high ceilings. 42" stand + 29" tank height and your at around 6' to the top of the tank. Reflectors 10-12" above the water + 16" depth of the reflector and you're close to 9' for the top of the reflector.
I would also suggest going with 400w MH
for that deep of a tank. 250 is cutting it close.
I bet you can't wait to get started. Me and Lowe's/HD got to be real friendly too.