The eMac, long out of production was available with G4 processors finally topping out just shy of 1.5Ghz, had a 17 inch CRT display capable of going up to 1280X960, they used various video adapters but the latest ones had ATI Radeon 9200 32Mb graphics built in The 1.25Ghz machines suffered a recall and alas extended repair service (a process I"m undergoing for one of mine).
It has to do with some of the capacitors on the logic board, sometimes the video would go nuts, sometimes it'll lock up etc. Nothing serious until fixed.
More specs, the later ones did come with either a Combo drive (CD-RW/DVD ROM) and some came with Superdrives (CD-RW/DVD-RW) 40 and 80Gb hard drives.....and yes, it's a royal PAIN to get to them too....
All in all, the later ones, great machines, loaded up with a Gb of DDR RAM they will run Leopard pretty darn fine. Hope this gives you some info.
If you require more info, I may point you in the general direction of
www.lowendmac.com specs and whatnot on most Mac models. (I am in no way affiliated with lowendmac or it's subsidiaries)