Re: DW 9000 vs. DW 5000
5000s and Iron Cobras seem very similar to me, but Iron Cobras weigh like twice as much, and they're HUGE.
And if you play in socks, you'll have bruises on the tops of your feet from the iron cobras because the beaters seem to bounce around alot more than any other pedal I've played. The beaters always whack the top of my foot on upstrokes...
Go play every double pedal you can find until you find one you like.
Or, send me 100 bucks and I'll sell you my Pearl P100 double.