What exactly do you dislike about your 56? If you just want to get a shiny new one that's fine, but try and tell us exactly what makes it so crappy. The more detail you can provide, the better we can help you.
I offer this advice:
-If you want more spin, consider picking up a 60 degree along with a sand wedge. The actual backspin will be virtually the same, but the higher trajectory will help the ball stop, especially on short shots. Lack of spin is the worst reason to replace a wedge, and the OEMs like to blow smoke up your ass about the grooves. Spin is gonna be 80 percent technique, about 30 percent dependent on the ball, and only about 10 percent the head and grooves. I think the shaft is pretty much there to give you a certain feedback and encourage a certain technique, so it can be very subjective. That's 120% you say? Exactly. Your expectations on spin are probably too high from watching golf on TV. About the first time you hit a false front 10 feet from the pin and rip the ball 20 yards backwards off it, you'll rethink this common myth that lots of spin is good. If this isn't an issue for you I apologize, but there will be others reading the thread for applicable advice.
-There are 100 billion ways to configure your wedges in your set. I prefer 48, 54, 60 lofts because I like long irons and can hit partial shots in lieu of a gap wedge. It's extremely personal, and based on how you use each one. I will say a 58˚ will help if you want a sand club as well as a higher loft, especially with a strong PW. Generally go with no less than 4˚ gaps in loft, and no more than 6˚ with 8˚ being an absolute max.
-Rust or a raw finish won't get you more spin. Forged wedges won't give you more spin. Neither will give you control or touch or whatever. But both will cost you more generally, and will certainly wear out faster. Chrome plating is a protective finish against rust and is very durable, so for a sand wedge it can keep it intact through heavy use. Soft forged clubs are softer and wear faster than cast, so really it's not worth it to most people to gain an allegedly slightly softer feel.
-Iacas and others might point you towards the Edel wedges, which are custom fitted and have very nice sole grinds, etc. It might not work for you, but it's worth reading and possibly getting fitted somewhere.