I intended to go with a true dual setup, but the local dealership guys (sales,parts,service) all said the same thing - V&H Pro Pipe. Four of them have 'em, and we got to listen to them all. I followed their advice (figured they couldn't ALL be wrong!), and am very pleased with the results - and the wife loves hers on her 2010 SG. They really let the bike breathe, add a lot of grunt at lower rpm, and they are LOUD when you get on 'em.
Had Reinhart TDs on my '07, and they worked really well at high rpms. The Pro Pipes give you that good old-school thump at low rpm, and the 103 gained a lot below 3k. Nice and mellow at cruise, but NOBODY will mistake it for a Honda!