@Clarkie
I think getting a graphics tablet is a good idea, but be very careful about your choice on size.  I'm currently between tablets (I don't own one right now), but I started off with a very early Bamboo, then upgraded it to a later one, and both of them were the small size.  Inbetween all that I tired a larger one and absolutely hated the thing and sent it right back, in fact I hated it so much that even the small sized Bamboos feel more bulky than they needs to be now.

Be very weary of getting a large or even medium tablet because the chances are, it'll drive you nuts.  As you've never had one before, the best way to think about it is that when you hold a pencil or move your mouse, what do you notice about the amount of movement when you draw something or write your signature?

Exactly, your arm doesn't move, your wrist stays in one place and you merely draw or write by moving your fingers around.  Check out how much area you actually need to do that and you'll find it's well within even the smallest size tablet area.  If you get a medium or large you'll end up wanting to lay it on the desk and use it, and that's very annoying because you can't twist it like a piece of paper unless you're holding it, and until you experience that, you won't realise how disorientating and irritating it can be.  Doesn't matter whether you want to sculpt in Blender, write, or sketch - get one as small as possible is my advice, because you'll want to hold it rather than rest on it, and believe me, holding even a medium tablet is an absolute pain in the arse :-D

Small and managable is the key to enjoyable graphics tablet usage, for me anyway.  Think of a small one as having a nice compact pocket sketch pad, but think of the larger ones as trying to handle a large newspaper on a very windy day - no thanks ;-)

One final pointer (and ignore this at your peril), is to make absolutely sure you set up the response area and sensitivity/speed correctly for your own use.  It will ask you to touch the opposite corners of an imaginary square, and when you do that, be sure not to exaggerate, just relax and do what feels natural because this is how the tablet adjusts to how much movement you have on your fingers when holding the pen.  Don't be tempted to touch the outer limits of the work area, you must do what feels right to you, because that's what'll make it feel comfortable and purpose made for you.  Take the time to experiment with the setup before you start using it, get it right and you'll enjoy the tablet.  Get it wrong and you'll want to throw it out of the nearest window!

The smaller the better, and set it up correctly, that is all ;-)