If you have the spring clip connections at the receiver, then banana plugs likely won't fit and you should consider the other style. I have 12 gauge speaker cable and on the surround channels of my Pioneer receiver (my secondary system) it has the spring clips. That size wire doesn't really fit, so I'd suggest 14 gauge might be the maximum size wire for bare wire connections.
If you have the increasingly common 5-way binding posts on your receiver that accepts banana plugs, get good quality ones. I like the locking style from Blue Jeans Cable, though you might not have easy access to that brand.