Dell xps 430 good deal or not? Alternatives?

Dell xps 430 as follows :

XPS™ 430 - (D03X302) Qty 1
Intel® Core™ 2 Quad Core Processor Q8200 (2.33GHz, 1333MHz, 4MB cache), Genuine Windows Vista® Home Premium SP1 - English Unit Price Incl. VAT £708.99

Save £80 (Inc Vat) until 11/03/2009
Expires 11 March 2009 View Details
- £80.00

Save £50 (Inc Vat) until 11/03/2009
Expires 11 March 2009 View Details
- £50.00

Catalog Number: 20211 D03X302
Module Description Show Details
Base Intel® Core™ 2 Quad Core Processor Q8200 (2.33GHz, 1333MHz, 4MB cache)
Microsoft Operating System Genuine Windows Vista® Home Premium SP1 - English
Memory 3072MB 1067 MHz Dual Channel DDR3 SDRAM [3x1024]
Keyboard Dell Multimedia USB Keyboard Black - UK
Monitor Display Not Included
Video Card 512MB ATI® Radeon™ 4850 Graphics card
Hard Drive 640 GB Serial ATA non Raid (7200 Rpm)
Floppy Drives and Additional Storage Devices 19-in-1 Media Card Reader
Mouse Dell Laser Mouse USB (6 buttons scroll) Black
Optical Devices 16X DVD+/-RW (Read/Write DVD, CD)
Sound Cards Integrated HDA 7.1 Dolby Digital Audio
Speakers No Speakers (Speakers are required to hear audio from your system)
Shipping Documents English Documentation with UK/Irish Power Cord
Gedis Bundle Reference D03X302
Standard Warranty 1 Year Premium Warranty Support
Enhanced Service Packs 1Yr Premium Warranty Support
Order Information XPS Desktop 430 Order - UK
Dell System Media Kit Resource DVD - (Diagnostics & Drivers)
Accidental Damage Support No Accidental Damage Support
Online Backup DataSafe Online Backup 2GB 1 year
Microsoft Application Software Microsoft® Works 9 - English
Protect your new PC No Security/Anti-Virus Protection - English

Can be had for £566.09 inc vat and delivery, is that a good deal, or can anyone suggest alternatives at same price?