Power mac g5

I am a new user this being my first post on the site and have been wanting to change from windoze to mac for ages and have the chance of a power mac G5. I will be using the machine for photo and video editting also a little bit of music in garage band hopefully. I have read that the g5 is no longer supported by apple, is this true and would you more experienced users still recommend buying a g5. The machine will be 500 pounds and the spec is as follows,
Whats in the box:

* Powermac G5 Dual 2.3Ghz
* Power Cable
* Pro keyboard and Logitech Optical Mouse
* DVI to VGA Adapter
* Restore disks (3 set)
* These are used items and hence have marks on the case from usage

Summary Specification:

* G5 Dual 2.3Ghz
* 256Mb 9650 Video Card
* Leopard 10.5 AND iLife Loaded
* Garageband , iPhoto , iDVD , iMovie , iTunes
* 4GB RAM
* 1x1TB Hard drive
* DVD-RW (Superdrive)
* 3 x PCI-X Slots
* 2 x DVI Ports on Video card
* Gigabyte Ethernet
* 56K modem
* 3 x USB
* 2 x Firewire 400
* 1 x FW 800
* Audio In: 1 x 3.5MM / 1 x optical S/PDIF (Toslink)
* Audio Out:2 x 3.5MM / 1 x optical S/PDIF (Toslink)

Warranty:

* 6 Months RTB

Can someone please let me know if this is a good deal and a worthwhile purchase please.

 

well cant seem to find the marketplace on here but managed to get the g5 down to 480 shipped and it does come with warranty so went for that. Anything here in uk at present with mac on seems dear though, but not nearly as expensive as new, hopefully i will be happy with the new mac and will surely be asking plenty of questions since only being on pc for years.