Depends on which sulky and how much mulch kit cost. If that's the best deal within an hr of you than you should take it. Or if that dealer has a Spring Expo it will be even cheaper then.
I have a Proline with the Super Flow System deck and it stripes better than any other 36" wb. Once I start cutting high grass it doesn't disperse clippings very well, but it doesn't clump either. The Ultracut is a different deck though.
There is an Old Blue Chair for each and every one of us, we just have to find it.
2006 GMC Sierra 2500hd crew cab
BOSS 8'2" Power V
Hustler X-one 60"
Toro Proline 36" wb w/t-bar controls
JS46 22" walk-behind (wouldn't recommend)
Shindaiwa T254, Echo trimmers, chainsaws, pole hedge trimmer, pole saw, hedge trimmer
Shindaiwa 633 and Husqvarna 130BT blower