Ok well general pointers include:
-Go for a dual core Intel CPU for best performance/money. Quad core if you've got extra.
-Get either an AMD 4850 or nVidia 9800GTX graphics card for best performance/money. 4870 if you've got extra.
-The best performance/money motherboards for Intel CPUs are the P35 chipset ones. P45 if you've got extra.
-4gb RAM requires a 64bit operating system, so don't forget to get Vista Premium 64bit (if you don't get this right away you can upgrade from the 32bit one by asking MS to send you the 64bit disc for a few quid).
-You don't need a separate sound card these days - most motherboards come with HD quality chips and you'll have more than enough spare CPU to drive it.
-You'll only need around 400W at most, so don't go for a mega watt PSU, instead go for a good make like Seasonic, Corsair, OCZ etc. and aim for around the 520W mark.
-14cm is an odd size for a case fan, might be better to go with a case that uses normal 12cm sized ones so you can replace the fans if the bearing get noisy.