If you have 200 to spend total then you need to subtract a good portion of that money for fans and exhaust if you use a big light like a 400 or larger.
But it looks like you just want to grow a couple plants. In that case I'd dump the flouro you have and buy two of the $20 HPS's linked in this thread:
https://www.rollitup.org/indoor-growing/113223-skip-cfls-20-150w-complete.html
Two of those would be many many times the amount of light you have now, and there's no way you can find a better deal than those $20 lights right now as far as lumens per dollar.
I'd also get a 6" or 8" ~ $40 duct booster fan to keep the closet cool, a few feet of ducting to vent it into the attic or wherever you can, and a couple oscillating fans. That still leaves nearly $100, you could DIY cooltube both of those, buy mylar, etc and have a really nice setup for next to nothing.