Can't go wrong with a Cat blade, period. Deere isn't as popular but they're a decent bang for you buck, same goes for Champion. Don't get sucked into buying a Komatsu blade. Outfit I'm with has one and it'll probably be the last, I think we have one of the few, if not only, Komatsu blades in the region and there's a good reason for that. Parts are more expensive than Cat and aren't readily available. $50K right now will buy you a pretty nice blade if you don't mind running something older. I'd go after an older 14G that's been taken care of, don't be afraid of higher hours if the maintenance records show consistent PM work.
Go hard, go fast, or go home