The industry standard is typically only one (1) year with some retailers offering two (2).
A three (3) year warranty gives you added confidence in the product you are buying and the knowledge that you are getting great value for money.
Please visit http://www.first4computers.com/range.htm to see the current range of PCs.
All PCs can be customised to your requirements. Alternatively I can build a bespoke machine from scratch to suit your budget.