Looks great so far.
What type of corals do you plan to keep in there?
If you just plan on keeping Softies/LPS I would just go with the 175w bulb along with the VHO.
If your thinking that you might want to eventually try to keep SPS and Clams, I would go for the 250w bulb.
Make sure to install a fan as well.......you'll probably need it with that much light over a 29g.