For your price range and light requirement, I think the 3.0 is going to be one of your best choices. 3 year warranty and waterproof, two features that Finnex doesn't offer. Sorry for the delay on my response! Busy weekend.
Also, for snail treatment, you can do a potassium permanganate dip to take care of nasties. Bleach works, but the potassium permanganate is considered safer. If you want to go the bleach route, I've always seen the recommended dilution ratio at 20:1. Washing first is a good idea to knock loose what you can, also visually inspect for snails eggs.
Fern ROOTS can be placed in the substrate, but if you bury the rhizome, it will rot and die. Driftwood or stone is great for attaching ferns, and you can use either super glue or thread to attach your plants.
What ppm for a PP dip do you recommend for plants?