Does it really sound good? If I connect my Ipod to my Cube 15x, the sound isn't that great... Just acceptable for playing along I'd say.
Rather I'd say buy 2.0 or 2.1 speakers according to your budget and needs... Especially while gaming stereo is a much better bet than just one. Really adds an extra dimension to your gameplay. Directional sound is better than a single source. Even two cheap speakers will be better than just a single amp in that sense.
5.1 is even better if you can afford it.
All you need is the passion. Everything else comes after it.