Have ordered two PCs from PC Specialist and both times have been an excellent experience. Lots of freedom when customising your PC, and lots of support, guidance and advice available from both PC Specialist staff and their own forum. With my second PC they gave valuable advice which helped me choose the most relevant PC to suit my needs. Upgradability is very easy, you can simply upgrade a previous order and still receive support, and the technical support after purchase is excellent. They happily help with any problems. Would thoroughly recommend PC Specialist, excellent company.