OP is your dimmer working out? If it is LGray23 makes a good point but personally I'd go farther and say wait to buy one with better accuracy. (herpstat, helix, ve, ecozone) The base model is just over $100 so in a few months you could likely manage to save that up.

If your dimmer needs fiddling all the time I'd buy the hydrofarm just plan your temps carefully and maybe at some later point buy something more accurate.

I can't speak to reliability of any of them, not enough personal experience.