UVs are all pretty much the same as far as function goes so you can usually just look for a good deal on one.  Bulbs should be replaced around 6 months, but some go 1 year.  I find wipers not very useful personally.
	 
	I have an AquaMedic and it is OK, but there are easier ones to work with out there.  I believe DF&S has the Gamma ones on 25% off right now.