To have an opportunity to own a budgeted and satisfying speakers is to go second hand, but provided that it is of A-1 condition. And the rule of thumb for the price is... it shouldn't exceed 60 percent of a brand new one.
On space restriction, in which is the reason we took up desktop, one should looks for the frequency range of the unit which is about 40hz to 20khz.
On the distance between the unit and the wall, it should not be less than two feet. And the toe in & out depends upon one's liking... I prefer mine toe out, I like the sounds went through the surrounding before getting into my ears.