Front door speaker recommendations for a 9N

Hey all, I'm buying a new head unit for my car tomorrow, and i'm looking at this:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...e=STRK:MEWAX:IT

and i was thinking i might as well upgrade the speakers while i'm there. I'm on a budget, and i don't want to get a sub, but i'd like some speakers with plenty of clear bass

I'm not really all that clued into the audio scene, but i was looking at these:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?Vie...e=STRK:MEWAX:IT

what do you guys think?

I have a strict budget of £50 and I really don't want to change the existing speaker wiring, so plug and play would be greatly appreciated!