You can probably easily beat any club deal on a DSLR online. Check Beach Camera,
Amazon, etc also. Beach has XTis for pretty darn cheap lately.
The D60 is going to be more new-DSLR-user friendly, with help screens all over the place and such. It will also have a better kit lens, both in terms of optics and build quality, but also it has image stabilization (or "VR" as Nikon calls it) - Canon's upcoming XSi kit lens has stabilization and supposedly much improved optics, but still crummy build quality, and XTi kit lens... well, it's never been well loved! And it is
not stabilized, unless someone is putting together a special kit with the brand-new 18-55 lens with the old camera. I suppose that's possible, as the 55-250mm IS is a pretty new lens, too.
A 1 gig card is virtually free nowadays, so don't let that swing you one way or another. You can probably easily find a 4 gig card for under $20.
Probably one thing to do is go hold both cameras (if you they're hidden away in a case at the warehouse club, go somewhere else to check them out) - the Nikon and Canon have a different feel, and some prefer one over the other. Certainly either camera, like any DSLR, is capable of producing great photos. You may also want to consider other brands (Olympus, Pentax, Sony) if you haven't yet, those each have unique strengths also and may be even a better fit for you.