Its good having all these VST available, however you are trying to run before you can walk, (Effectively you are trying to learn Yamaha, Korg, Roland, Ketron, Technics etc. all at the same time) so start off with just 1 VST and get used to its operation before moving on to others. (Bandstand is probably the easiest as it is a standard balanced GM sound set, (And can be treated as such) but of a much higher quality than you get in most arrangers)

Once you get into it you will find that your gear lust for new sounds will disappear, and while you will probably want to buy more VST, they work out at a fraction of the price of a new board.

Happy Playing

Bill