Hey guys. Having used Windowz pretty much my whole life, I've decided I want to try and use Apple.

I have no real reason specifically, I'm not an artist per-se. I don't compose music, make videos or any of that other stuff most mac users do. But they do look cool. Anyway - what I wanted to know is if it's really worth paying a shed load more money for a higher spec iMac?

The two options really are the 21.5-inch screen or the 27-inch screen. Now in terms of technical spec, I don't know if I'm really going to notice the difference? I use it for collecting internets, photo editing, web design and watching films and the like.

Is it really worth paying the extra for the 27 compared to the 21.5 - these are the specs:

21.5-inch: 3.06GHz
3.06GHz Intel Core 2 Duo

1920 x 1080 resolution
4GB memory
1TB hard drive1
8x double-layer SuperDrive
ATI Radeon HD 4670 graphics with 256MB
£1,199

or

27-inch: 2.66GHz
2.66GHz Intel Core i5

2560 x 1440 resolution
4GB memory
1TB hard drive1
8x double-layer SuperDrive
ATI Radeon HD 4850 graphics with 512MB
£1,599

I'd more than likely upgrade the 27inch to an i7 anyway. So thoughts? Is it worth it for £400 - and will I notice the difference for what I do?

Thanks.
Adam