If you are planning on moving towards a full reef most people recommend that you don't use a UV
light in the system. I've forgotten the reason why, maybe some of the others will chime in with why that is. You may be able to save your self a couple plugs by ditching the canister (put the rubble in the sump) and the UV
I don't know how much power either of those really uses that you would be able to put towards lights. But just thought i would throw that out there as something that may possibly help your situation.