Buying ibook ram in the uk

Can anyone tell me the cheapest place to buy 512mb of ram from an ibook?

I havn't bought the ibook so do i do one of the following...
1. buy extra 512mb installed in ibook for £86.95 (edu discount)
2. buy CT6464X265 from crucial for £41.11 here
3. buy CT410199 from crucial for £71.66 here
4. buy 512mb from novatech for £78.58 here
5. some other site?

I emailed crucial and they say they cannot guarentee compatability with the ibook, they want me to buy the £71.66 one.

shadowmoses said:

get one of these
http://www.crucial.com/uk/store/listparts.asp?model=iBook+(G4+1.2GHz)&tabid=AM

they are compatibe with your ibook

Click to expand...

I never even looked at 1GB of ram, but for £10 extra, thats got to be the best deal!

thanks, shadowmoses, think I will play it safe and get what is reccomended compatability.