help with budget living room pc

i'm putting together a cheap pc for family to check their email and browse on, it will be running xp. i might occasionally use it to play a game or two, photoshop, maybe light 3d work and do things that i can't use my mac for. target price is around £250, i have a 20" tft to use with it already.

i plan to shop at ebuyer.co.uk

i want it to be intel based, best i can afford is 4500. so i can choose between 2160, 2170, 2200 and 4500. does any one of these overclock exceptionally well? i will decide which cpu i get after i know how much everything else adds up to.

ram will be 2gb £35 http://www.ebuyer.com/product/116755

hdd will be 250gb SATA around £40, no idea which one... there are so many to choose from, can someone recommend a brand/line?

graphics card (not really necessary, but i've been deprived of games because of my mac for too long now), i have no idea which one! i don't want to spend more than £50.

mobo will need; intel 775, ddr2 (up to a decent speed), sata and pcie. decent amount of usb, ethernet and all the standard stuff. no idea which one to go for, this is the one component that has me most confused. mini-atx, wouldn't hurt and neither would an ide.. but these are not important.

power supply, just tell me roughly how many watts it should be and i should be able to figure it out or if you're feeling helpful, you could recommend something suitable and quiet.

estimations...
ram - 35
hdd - 40
mobo - 40
psu - 25
case - 30
= 150
cpu - ?
gfx - ? (low end ati, might be good.. could keep price closer to 200 this way)
might throw a card reader, sound card and dvdrw onto it if i have enough cash left over.

i'd like to make the order before i go to bed tonight, any help would be greatly appreciated!

RAM = http://www.ebuyer.com/product/116755 = 35.00
PSU = http://www.ebuyer.com/product/120375 = 31.15
MB = http://www.ebuyer.com/product/132272 = 38.25
HDD = http://www.ebuyer.com/product/124732 = 39.58
CPU = http://www.ebuyer.com/product/141242 = 41.66
GFX = http://www.ebuyer.com/product/126987 = 39.99
Case = http://www.ebuyer.com/product/125959 = 9.99

235.62. Best I could do. Had to pick Antec PSU as I am unfamiliar with the other low cost brands. Antec is very good quality. MB has decent on board GFX if you wanted to wait on the vid card. There are less expensive GFX cards, but not for gaming. 8500gt is about the bottom end.