If the Remora seems to expensive, I think the CPR will be fine for a tank that size. I started running one on my 40g about 2 weeks ago, and I'm impressed with its effeciency. Granted I can only compare it to a Prizm, but the difference there was night and day.
Either of the 2 you've selected are going to treat you well, so I wouldn't sweat that.
If you do go with a sump, the in-sump skimmers are supposed to be more efficient than the hang-on models.
Former advisor and planted tank geek...life's moved on though.