It doesn't say it comes with an accelerator card or any memory expansion. You'll have to get an accelerator card for it for the A1200 to be much good. I don't know about the price at all since I haven't bought an A1200 since my first in 1993. You'll probably be better off with AmigaForever on your MacBook for most purposes.
If you want to play games on your A1200 look for a 68030-based accelerator since those seem to be the most compatible with WHDLoad and so on. Try to find a PAL-capable monitor since you won't be able to use the composite outputs in color on an NTSC monitor due to differences in the colorburst signal on the chromanence cable.