I wish I knew enough about "wood shop" to build my own stand!!
Ok, I was in the same situation as you a while back. I went with the 75P, very nice tank, but you have to have a stand made for it or make your own because there are no 30"x18" stands in the business. None.
So I made my own, not an easy thing... It can be done, and is done all the time. If you search, there are tons of DIY ADA style stand threads, use them, they're helpful. The 75P is the better deal, but the extra horizontal 6" on the 90P is very nice as well, and 36"x18" stands are actually made and sold by a few manufactures.
For the filter. I'd recommend an XP3 for value, and if you're and eheim fan, an classic 2217. Tons of Bio and mech filtration, and get a couple 100mL purigen backs, they're amazing.
For the light. This is between T5HO and MH. I personally went with Metal Halide hung from my ceiling and never looked back. They create a beautiful affect and are ver asthetically pleasing. Great light output as well! This
is the fixture I got, but with this
bulb (amazing bulb). I'd buy this version
of the fixture, as it doesn't have the retarded 13000K bulb in it that the Drsfostersmith one has in it, then put the ADA bulb in it, PERFECT COMBO. It's what I should have done first, it would have saved me $80!
Instead I'm now left with a useless 13000K bulb that was actually marked as a 10000K bulb on the site!
For ferts, get some dry KNO₃ and KH₂PO₄, then buy a 500mL bottle of both Brighty K and Brighty Step 1
Substrate, I recommend AS 1, and if you have hard water, go with some AS II. Make sure to get one 3L bag of powder for a top coat to make planting easier.
PLEASE get some Seiryu stone from www.adana-usa.com
, they are such beautiful stone.
Good luck, and I hope this helped. Check my sig for my journal to see how it all turned out for me! BTW, I'm re-starting soon with better materials.