I have a lil micro cube made by roland and i love it can ge almost any sound out of it at reasonable volume! I maybe wrong but i think it is also cheaper than the lil vox amp! also i know crate have not long brought out a lil practice amp it looks similar to the micro cube worth a look

link to the crate amp i mean
http://www.musiciansfriend.com/product/Crate-Profiler-MLX5-5W-1x8-Guitar-Combo-Amp?sku=482076
herd gd stuff about it.
the micro cube is quite popular and will be on most guitar shop sites