Hard to sit with good posture at my computer.. always slouching, need a comfortable chair?

Hard to sit with good posture at my computer.. always slouching, need a comfortable chair?
I have the same problem - if you aren't concentrating on sitting upright you find you're suddenly slouching, however I've found that by sitting on one of this big exercise balls forces you to sit with the correct posture.

Furthermore the one I have is at exactly the right height for my desk & works like a charm & has already improved my posture.
I work from home, on my computer. For some reason I find it difficult to sit with a straight back for more then a few minutes.. I dont think its physically difficult for me, but its not comfortable to me at all.. the bad thing is, ive gotten used to slouching horizontally across the chair and putting my legs up on my desk.. this is bad though, as over years i think its been causing some mis-alignment in my body, its not natural to lye across a chair that way, so it pulls my back / chest in a weird way.

Anyway, my question is, how can I find a comfortable way to sit straight... a normal office chair doesnt seem to work for me.. I kind of want to be reclined a bit, with my whole lower back supported.. as if in a reclining massage chair... any ideas?

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