MAC PEOPLE. I NEED HELP.?

Could some one please tell me if this used Mac sounds good? It's on Cragis List right now and I'm thinking about getting it. Problem is, this would be my first Mac and I know nothing about them and some other things about buying computers.

I would like to know if the memory size is ehh.. good? (yeah..thats something I dont know much about)
and how old this Mac is.

Heres the description:

1.8 GHz 20" Mac Desktop with 1.25 G of RAM, Mac OS 10.5.5, SuperDrive for burning CD's or DVD's, GeForce FX5200, 2 Firewire ports, 3 USB ports. Wireless keyboard and mouse. iSight camera available for $75 for video conferencing. Contains tons of software including Microsoft Office 2008, iWorks, iLife, MacroMedia Suite (Dreamweaver, Flash, etc), Filemaker Pro, Final Cut Pro. Owned by a high end user and Apple Distinguished Educator. This is a bargain!!!!
Ok thanks. This would bevery good for me. I would get use out of a lotof the Apples software like Garage band and stuff and all the added software too. Im just a little unsure about using Craigslist for something that expensive.