In another thread I was talking about upgrading my SX bass.. Well, I've been tossing around the idea of a J/MM configuration. Few questions.. First, what advantage would I have going with something like this over just a J/J config? I mainly play jazz and slap.. Would have a MM pickup really help at all for what I do? This is what I am looking at as far as equiptment: Bassline Stack Series Neck Bassline Musicman for Bridge Aguilar OBP-3 Would this be a decent combo?? For the three of these, I'm looking about $320 with tax new.. This is a bit more than I had planned on spending. Do you guys have any suggestions on something maybe a bit more cost effective that would still yield me a "big improvement from stock SX" sound?? I really no nothing about upgrading when it comes to pickups, so any help would be GREATLY appreciated. I'm open to any and all suggestions.. I want a good sound, but I'm trying not to go overboard on a $120 bass..