I have a minibow 2.5 for one of my boys, and I actually really like it. I did replace the filter with a tetra 3i (not the best filter; a small sponge filter or an azoo palm would probably be better) and replace the bulb with a screw-in compact florescent so I could grow some plants in there. the filter that comes with it isnt so bad though, I have it running on another tank actually (critter keeper) and it does an okay job in there.
personally, I'd get a minibow 2.5, azoo palm filter, and hydor mini heater. replace the light with a screw-in florescent and grow some easy, low light pltants. 50% water change weekly. I have a pretty similar setup (different filter and I odnt use a heater because it stays at about 80* because my room in warm) and out of my three other boys, the one in there is by far the happiest.
ETA: the above suggestion would work equally as well, I just like the contained look of the minibow, and it comes with a light.