srcatch the MG, it's horrible, especially at that price.

i don't know about the fender, but i can imagine it not having very good tone, i don't know though.

i haven't got a clue if these can do the backing track stuff you want, but i'll let you know about 'em anyway:
if you play mainly heavy stuff, check out the roland cubes.
if you play mainly the lighter stuff (up to hard rock at max), check out vox valvetronix's.