I would give the slight edge to the Rockchucker kit, mostly because of the 505 scale (which I have and like) and the Uniflow powder measure (which I prefer over the Hornady that I had originally). Press only preference goes to the Hornady - my old 00-7 press has a slightly larger opening than my Rockchucker (the original, not the supreme), and the press is angled @ 30 degrees or so - more room/better angle to fit the hand in to place shells than the straight-on Rockchucker. The new R/c also has a bulky/awkward primer catch tray IMHO.
Personally, handheld primer units (like the RCBS one in the kit) make me nervous (something about holding a bunch of explosive devices an inch above my knuckles while trying to sqeeze another one into a shell). Also don't care for the primer tube and arm that the Hornady uses either - filling tubes can be a pain (again IMHO). I use a Lee Auto Prime II that screws into the press like a die and seats on the top of the stroke - plenty of "feel" for a poor seating primer before crushing it. Primers do tend to jam at the top of the feeder trough, but a light shake of the trough frees them up easily.
Don't forget a few of the other essential accessories, like a tumbler and media separator, check weights for the scale (Lyman makes a good set), at least a couple additional load data books to cross check load recommendations, and a powder baffle for the Uniflow (if you go the RCBS route) - keeps a consistent weight of powder over the drum regardless of the volume of powder on top of the baffle - part of the reason I prefer the Uniflow over the Hornady measure. RCBS also has two different drums for the Uniflow, a larger capacity one for large rifle cases, and a smaller one for pistol/small rifle. Might want to find out which one comes with the kit.
Midway has the Rockchucker setup for @ $235 + shipping right now.
Going single stage when starting out is a very good idea - progressive can get expensive just for the press, and there's alot going on with each stroke to keep track of, especially if just starting into reloading. You can always expand to a progressive later, if/when the desire arises to crank out more rounds per hour, and you'll still need most of the equipment you get with the single stage setup. And you'll still find a use for the single press even after buying a progressive one.
Just my nickle's worth.
GP