Maybe it's me, but the Vic 20 is less of a "Wonder Computer" and more of a stop gap. Poke this, Poke that, no direct access to graphics or sound, The character set is woefully small and cramped and it didn't have a built in monitor.
while i can understand some frugal people wanting to buy one to save money in 1980, you have to understand that a coco could give you graphics and sound at a
better price, the TI-99/4A allows for easier editing and more ram (around 64k i think) or if you are in britain, the ZX Spectrum or BBC Micro is a much better choice.
my opinion, however most assemblers are easy to use, but 3.5k ram is ridiculous