The great thing about crowbars is that you get to be unique and can create a custom set. asking what type of crowbars you should get is like asking what type of shoes you should buy. essentially it all comes down to personal preference. Take some time to look around and decide what you might want. What lens? Frame? strap? riggers?
be warned that dealers and oakley only sell full set ups, with the exception of lenses (i think). so if you really want to get creative, look in the NS B/S/T forum for different parts or peieces.
hit up my man ogfeez who has alot of stuff to sell. hes totally legit and great to work with