Bi-wiring will offer an incremental improvement in the sound for your speakers. The only jumper/cable combo that equals or betters this that I've tried is from BEL. Everything else was not as good as traditional bi-wire. XLO and others (pick your favorite) work well.
If you're not sure this is worth the expense, ask your dealer to loan you a bi-wire set to take home and you'll see what I mean. The jumpers just aren't going to cut it.
Regarding wires in general, I suggest you use the same type throughout the system. That way it's really a component and not a tone control.