Hi Skinn. The price is probably reasonable, but without knowing more it's impossible to say how good. My main observations are:
a/ The Sempron 3000+ processor alone is abot £80 click here
b/ If the graphics are integrated, the motherboard is probably micro-ATX and would severely restrict your future upgrade options.
c/ If there is no floppy drive included, is there a space for one in the case?
d/ Don't be too impressed by the keyboard and mouse, although excellent in themselves, they are available for about £12 + £6 postage click here and click here.
e/ A very good £17 inch totally flat faced crt monitor is available from the same supplier for about £80 click here.
The market for computers is so competitive that I don't think prices will change much after Christmas.