As suggested above, lighting is very much a matter of personal taste but it makes sense to invest in something versatile. I have to agree that, budget permitting, moving heads are a great effect to have.
A moving head can be used all night and, with the right control, can create almost any effect you like. First dance? simple, slow panning white beams. 70's disco? Easy, use 'em to flash primary colours spots like 70's par-cans. Modern dance? Go nuts with strobes, gobos and colours.
The best thing I ever bought was 4 ACME spot knights (I solution 4S) which I used as the centrepiece fo