Its up to you really, what you can/ want to spent.
Sometimes finding one used in the size you want take a lil time. See if you have other online places for your area or free papers people would put such add's into.
If you wanna go DYI on the stand & hood I can gladly post you some pic's of what I done (since I'm too lazy to find the org thread from few months ago lol)
I built my cabinet (cause I couldn't find what I wanted) and my hood myself, hood cost me about $10-15 total incl bulbs and all
Well the 1 add that pretty much wants to be paid what they spent, no. The one 20g where its just the tank is ok'ish I guess (always try talk them down lol)
Like I said, love canister too but is indeed a pain in the rear if you need to take it apart for ANY reason and no mater how well you plan ahead how to take the hose off, you will have water around your tank and/ or floor. So for this reason, love the Cascades the way they're built.
If I was to buy another one, I'd actually buy a smaller one then what's recommended for 45-50g cause they're too strong really (175GPH right now) so I'd pers buy one "class" lower for my 45g and use the big one of the 45g for the 55g tank.
And there again, for the fish, nor the plants nor the sand would you wanna have anything that "pushes" the water around. I had several tanks set up with DIY sponge filters (HMF) and there I used circulation of 2-3 times the tank's volume per hrs and that worked just fine.
And another point why to not get a too strong filter: Gourami will love slow moving waters not a tsunami in the tank
For the shrimp, I suggest leave them as a shrimp farm in the 10g and only add your fish over to the bigger tank. Gourami Betta & Co will regard them as snacks...some may be able to hide, others will be eaten, so I'd pers keep them in a farm.
If you want sand anyway: Have yo considered pool or playsand? I'll also post you a pic of a tank (Cray's) set up with playsand...its like ~$5 for a BIG bag here... Just figured I'd mention that idea...
Test kit is one thing I def wouldn't safe money on, long term you'll need: NO2, NO3, Ammonia, Ph, KH
Plants you can find good quality to more then fair prices here Sweet Aquatics
Cost for DYI stand...urg...help me remember I think the stand I built for the 55g with wood, glue, nails, clear coat etc ran me something like $50-55, maybe lil less.
And here's the promised pic's