I would definatley use them for bittering, but you will have to use something else (like amarillo, centennial, cascade, simcoe, citra, etc.) to overcome the potential "onion" aromas.
Try this:
1 oz centennial first wort hop (60min)
1 oz summit (60 min)
1.5 oz amarillo (20min)
.5 oz cascade (15 min)
.5 oz centennial (10 min)
.5 oz cascade (5 min)
.5 oz amarillo (3 min)
.5 oz cascade (0 min)
1 oz cascade dry hop @ secondary for 7 days
BTW if you need hops I can hlp you locate them at really good prices.