I'm very happy with my 600D - excellent camera.. the kit lens (18-55mm) is pretty decent for an actual kit lens - but the best advice would be to pick up a Canon EF 50mm F/1.8 prime lens (which you can get for around £60). On the 600D with it's APS-C - it's effectively an 80mm lens which produces very good results indeed (i..e ideal for daily snapping and portraits etc). In fact, I'd go as far to say that £ for £ I doubt there is a better lens/camera combo than the 600D and the EF 50mm lens.
It has the option of shooting in RAW and JPG at the same time.. and once you get comfortable shooting in RAW - then use a decent programme like Adobe Lightroom for your post processing.
Here's a couple of sample pics I took in Hong Kong recently:
EDIT: forgot to say that if you want to run custom firmware which improves a LOT on the stock features of the 600D - then it's also compatible with Magic Lantern - see here for info:
http://magiclantern.wikia.com/wiki/Magic_Lantern_Firmware_Wiki
Hope this helps!