Putting a Pentium4 into something small

[crisbduck]

Hey, I'm hoping this is possible and cheap;
I own a Dell dimensions 5000 with a P4 at 3.00 and i'm pretty sure its socket 775
I've got 2 1gb sticks (and two 512mb but i dont think they'll fit)
I bought a 4670 for it too.
(sorry if I've used the wrong terms etc.. hopefully you know what I mean)
I'm guessing those are the parts I could reuse and put into a small machine.
I think i have two options, buying a shuttle(or another barebones system) and just adding all my parts, I've seen a few for around £180. Or buy all the parts on their own but this is where I get totally lost.
cheapest possible would be great thanks! xx

Edit: I don't mind second hand too much, I just worry about warranty

 

[crisbduck]

Hey cheers for the advice,
the 4670 is in a pci-e slot atm (im 90% sure)
and I downloaded cpu-z to check what my p4 was,
it says socket intel pentium 4 530, 775 lga, code name prescott,

ill keep looking!