I've bought several Pc's from pc specialist in the past normally i build my own but my partner needed a new machine and didn't have time to wait for me to get back to the UK and build one
When i priced up the parts i could buy separately ( from reputable dealers including separate postage) it wasn't much more expensive than building it myself something like 20 pounds which seemed pretty reasonable so I sent them her old Coolermaster. CM Stacker 830 to put new hardware in.
We have had no problems to call to test the warranty but there initial service was prompt , the quality of the build
( cabling , layout etc was neat and tidy )
Don't touch Dell , they are fine for there affordable laptops and all in one pc's for Mr Joe average , but if you want to get something a little special and not have it locked up so tight Harry Houdini couldn't upgrade / over-clock it
Lets not even start on the driver issues I've had with DELL re branded components and other Os's or even clean XP