Hi
Don't get a bath tub, as they occupy too much space unless of course you have a big house I bought a product called summer baby bather which is mini semi reclining chair to put in the bath. At least it takes up less room and then when you have completely finished using it fold it away - although I still havent worked out how to fold it yet.
Otherwise if you want to get a baby bath - how about a folding bath.
For a proper bath that supports the body, I've seen one of those, will have to look for it on the net, I can find out if you are interested in that.
HTH
I know this probably is the best advice but i wouldn't get one i used LO's bath about twice paid £20 for it and was a real waste of money in my opinion when she was first born it was so hard to bend and wash her that i used her own washing up bowl which cost like £2 in the sink so i didn't need to lean over then when she got to big for that she had a smallish bath in our bath but by that time she was almost sitting so with a week or so of doing that she was in a bath support seat
We had the bath support and LO screamed at every bath. I bought the 'My Jungle Family' bath from Mothercare for £9.99 and with a little water in the bottom of that and her lying down, she is happy in the water.
The side of our bath is quite high so it is easier on my back to put her tub on the bathroom floor and sit with her.
As for storage - I keep it in our bath while we're not using either. I just prop it up when we use the bath for ourselves.