Don't buy R4.
Official R4 support died over a year ago and most R4s now are just clones.
Get an Acekard 2/i, M3 Real/Zero, EZ FLash, Cyclo DS. All are better carts. YOu can get an Acekard for £7 on Dealextreme. Do yourself a favour and avoid the R4 logo.
Also you don't have to put a capital letter at the start of each word.