Asking myself the question, "Would I be happy to gig with that rig?", my answer would be:
Yamaha BB424X - absolutely, very fine basses
Ibanez sr500 - don't know because I've never tried one
Ashdown 100W combo - no, I'd be looking for something more capable, there's lots to choose from in the Basschat Marketplace
If you're looking for something to help you hold your own in a band, pedals won't help you play better - you need a solid grounding in the fundamentals of bass playing.