1 5/8ths BBK's are probally the best bang for the buck. If your going to go shortie then just go unequals, if you want more just go ahead with some longtubes from BBK.
I recomend longtubes, I think they are worth the extra cost even though you will need to get a short H pipe along with it or have the current H pipe cut shorter. I have a set of BBK 1 5/8ths ceramic shorties I got as collateral in a parts trade, they were painted black but otherwise in good shape, if your interested PM me.
Oh yeah, while you are at it, get copper head gaskets or you'll learn like I did.