This Pearl 10x6 might be worth checking out. At $315 on Amazon, it's quite pricey for a popcorn snare, but I'm sure the Mike Mangini snare wasn't cheap either. For that price you're probably getting into DW territory.
Found this Gretsch 10" snare that's only $135 on Amazon. Not quite as snare-y sound as the Pearl, but half the price.
I'm not really a fan of PDP drums, but I'd have no problem buying a PDP 10x6 snare as an auxiliary snare. They sound great.
From what I've found, cheaper popcorn snares can still get a good sound. (Unlike buying a cheap 14" snare)
But if you want arguably the best quality, I'd go with a DW Collector's snare, but you'd have to order it directly from them and wait for it.