I just had a quick look & presume it's the reconditioned E-Machines 2.6 Celeron?
If it was me I would go for the next one up at £399.99 - it looks like it has an actual graphics card rather than the cheaper one's onboard graphics (which may not be upgradeable, some E-machines with onboard graphics, don't have an separate AGP slot) - also bigger memory & hard disk plus MS Works & Money (the cheaper one only comes with the operating system.).
But for someone just starting out, the cheaper one is fine - it's up to you