I have the Dainese back space protector - no complaints, tho I haven't crash-tested it yet (KNOCK ON WOOD!) ;D
As for suits, I recommend motorace.com, which is where I got my suit. Because they are phasing out carrying Dainese suits, they're prices on Dainese suits are great (to clear 'em out, I guess), but the downside is that they don't have every size. Worth a try, tho!!