Best value for money and only new one near those specs and price is the TPG widescreen notebook. Which has recently recieved free upgrades to the optical drive, ram and processor.
Shop front is better to buy from because you can haggle.
I bought a Toshiba Tecra A2 for myself and a 12" ibook for my girlfriend about 4months ago, i'm very pleased with both. Here are some observations:
For The ibook I was paying more for less, eg price versus specs and performance.
OS X is excellent.
The ibooks build quality is suberb.
Virtual Pc is a joke and a waste of money as it is very slow.
There are no drivers for any canon multifunction printers.
Centrino is excellent, look online for details and if someone tells you its just wireless or something like that they're an idiot, centrino is three things: wireless connectivity, chipset and processor. The most important part is processor, basically its speed and power use is lower but its performance is the same.
Celeron M (not the same celeron as you see on older entry level notebooks) is quite adequate performance wise as it is identical to a centrino chip just has less Level 2 cache.
XP professional is a must for security reasons.
And now for some general notes:
DDR is better than SDRAM, don't (if at all possible) buy anything with SDRAM.
Haggle and get more ram (didnt work for me with the ibook so at the shop I got mine I negotiated for 512MB of brandname ram for the price of 256mb of cheap ram) put extra 256 in both, great investment.
Upgrading is actuley quite possible, the parts are more expensive than desktop ones and you probably wont want to upgrade wthin a year, so you can keep warranty.
Resale value of all notebooks is quite high, apples slightly higher.
Buy new or at the very least from a vendor so you have a warranty of some kind.
If you can get wireless chucked in for free take it, dont pay for 802.11a or 802.11b if they are offering 802.11g cheap then take it if not do the upgrade youself later.
Expect cross-platform compatibility issues with OS X but if you have a fairly good knowledge of computers you will adapt quickly.
Upgrading ibook a littel harder but still do-able.
Openoffice is very good.
Stop using IE use Firefox.
My final advice:
Get a windows laptop because then you can get lots of {free} programs of your mates and the internet.
Get one with a DVD burner (if possible), cough more {free} stuff.