I checked the marantz arent on sale any more, they had the mcr603's on sale, but now they just have demo's for $499, its a decent unit and has a cd player built in, Im almost positive it has a sub out though...
Im thinking if it were me I would go with a preamp like the usp1 and a separate amp like the apa150 total cost would be around $500 but you get complete sub and main frequency control that most receivers or integrated aren't going to offer... then upgradability is another plus, you can add another apa150 and run them mono or bi wire, or add a bigger amp, endless possiblities..