Ok, so the title isn't completely accurate. I'm actually looking at getting a desktop for the house (seeing as I currently only have slow laptops). I do intend to game on it as well, though I hardly expect to be playing newer games on anything above medium (considering I don't plan to invest regularly in new hardware).
This is the PC I'm looking at: http://www.currys.co.uk/gbuk/hp-pavilion-p6320uk-04144035-pdt.html
If you click the Find Out More (or Technical Details) link, it'll list all the specs.

Seeing as I'm hardly anything even near an expert at PC gaming, could you guys let me know if thats a decent/good PC for gaming?

Thanks :D 

I don't think this PC will cut it for games. As far as I can see the 5450 is not really capable of churning out decent framerates even at medium settings. This being a brand PC I can pretty much guarantee that they used minimal components for the power supply and motherboard, making simple upgrades such as slapping on a good graphics card a non-option. I got my PC from E-bay (great price, had to put in my own harddrive though). If you find a custom gaming PC on auction, it will most likely be a machine that can be upgraded (a powerful power supply, good SLI capable motherboard will allow for easy performance tweaks). 

Just my two cents. 

Alternatively, I was also looking at a Dell Studio XPS 8100. I'm not sure if this link will work, seeing as it is the Irish site, but here it is: http://ireland.dell.com/ie/en/home/Desktops/studio-xps-8100/pd.aspx?refid=studio-xps-8100&s=dhs&cs=iedhs1&~oid=ie~en~510295~studio-xps-8100_d00x8104~~

I would go with an Alienware desktop, but I don't have the money right now as I am in college.

The first build you linked is weird. The Core i5-650 is a CPU with an onboard graphics processing unit, so it doesn't make sense sticking a 5450 in there as well. In addition, neither of those solutions will let you play games very well. It also has more RAM than you need and the rest of the components are probably crappy no-name parts.

The Dell one has a CPU (Core i7-860) that's WAY overkill for your needs, a slightly better but still inadequate graphics card, an overkill amount of RAM (again), and two drives in RAID 0 which may actually be harmful to your data. And, again, most of the other parts are probably substandard too.

I know you said that you don't know much about computers, but I'd honestly recommend building one yourself. It's not much harder than putting together Ikea furniture, you'll get the exact components for your needs (no more, no less), and you can almost definitely do it for less money. While I'm not terribly familiar with PC prices in Ireland, I could spec you out something that shouldn't set you back much cash.

That would be great if you could tell me what sort of specs/parts I should be looking for. To be honest, the biggest load it will be under will certainly be gaming. I will be using it for other stuff, but most of that will be stuff like MS Word, surfing the net, but nothing else that an average everyday computer can't do. The biggest reason for getting a desktop is certainly for gaming, seeing as my 3 year old laptop can still do everything else I need (though it does overheat from time to time )

Don't skimp on the graphics card: it's the single most important piece of hardware. You have to learn what the numbers mean in the card.

For ATI ex. 5870, 5 is the generation, 8 is the power, 7 is linked to the memory used IIRC.
For nVidia ex. GT285: 2 is the gen. 8 is the power, 5 indicated an improvement I think.

So, a 5470 is very weak, while a 4870, though last gen, will be much more powerful.

I'm also looking at buying a desktop, primarily for gaming, as I have my laptop for other projects and work. Consider this a glorified tag, as Greyian is in much the same situation as I and any help you offer him would also help me immeasurably.

have a look at this 1http://www.novatech.co.uk/novatech/pc/range/irush.html

Actually the third digit is the relative position within the level of performance. It doesn't indicate which ram is used.

Thats pretty decent for a prebuilt PC, especially the 2nd one with the HD 5770.