Xp3 with a nice power head would be a good combo imo, just run ceramic media and mechanical black filter pads in the rena, I had the xp4, sometimes its tricky to get primed without air inside the can, so make sure all hoses and fittings are tight! I would put the intake on one end and the power head on the opposite side so it blows the poo into the filter! With a good circulator a spray bar isn't necessary! Here's one I use maybe go with the 1050, awesome site too!
Free s&h on orders 49.99 and up, ph is 44.99 so buy some food or testing supplies!
http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=23592
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