Well in that case don't buy Push Push, I think it's awesome, but since you need everything to be complex or not "too repetitive", you would not enjoy it trust me man.
You said you don't use it as a "makeshift iPod", I think, if you're playing a song that is just awesome sounding and fun (to the person playing it), it dosen't get better than that, so I don't really see how you can manage with the way you decide what songs you want to play (isn't it about enjoying the music as you play along to it?), but whatever I guess.
I can't play a song like "If 6 was 9" (Jimi hendrix pack) because even though it's challenging, (and admittedly pretty tough) I hate the song to death, which is a good example of what I mean, and you seem to be the exact oppsite to me when it comes to how I judge songs I want to play, like Im sure you'd buy a song like that (something in the same vain at least), because of the challenge it brings, despite if you liked it or not, that's what get from your notion.
What's available in RBN noowis perfectly fine, wanting more songs? of course I do, Doomsday Party, Africa, and the Texas In July songs are awesome, and I want them, but Im happy with what's available now.
Anyway, I guess this conversation is over, nothing else to say.