If I were in your shoes know what little I do now, I would find a Roland cube 15. I bought a micro-cube, which has the same electronics but can be battery powered, about a year ago and the portability has not been a benefit to me. The 15W cube is cheaper than the 2W micro.

Then, after you learn what you like and get comfortable enough to plug in to an amp at the guitar store of your choice, you can decide what sounds best to you. I don't know if everyone feels this way but I don't even want the music store staff to hear my limited abilities. So, I have decide that the micro cube and the borrowed bass amp will do me fine until I feel comfortable sound testing one on my own. Unless I find a killer deal on a more powerful cube.

Just one more opinion.

Correction: Cube 15 does not have the same effects (COSM) as the micro or the other cubes.