If you're only getting plants that attach to driftwood and rocks, those are low light plants like anubias, java fern, and mosses.
You'd be fine with that budget to get a Finnex Fugeray 48" (or 2x 24" versions).
If you want at least medium light to grow other plants, get the Finnex Ray 2.
BTW, although these fixtures come in 48", if the tank setup allows you to setup two 24" fixtures side-by-side, I'd get those instead.. so if the light is defective, it would only affect half the lights. Oh and make sure to get the "DS" model if you get the Ray 2 -- which is all daylight 6500K, not actinic.