I currently have dell 6224...so you think thats good enough?Thats pretty solid, plus with these throughput numbers, it'll simplify any security you want in place. There is no theoretical reason why L-3 would help you at the switch level. I'm not 100% on the support of Jumbo Frames in PFSense based on your Network card...just because every card is different. But It works on mine.
Just bought dell 1052P for $420...Tough to say. I paid to up to a 48 port over a Stack situation based on the cooling noise and power use of two tandem switches. Sometimes the cost of upgrade is worth it to consolidate. I'm not sure you're personal situation but I love the new X1052 if Dell is the right tool for the job. If POE is not a factor for you, you could consolidate into one unit for close to under 300, sell off your old one for something (even not much is something). Power consumption is far better for this over stacking, plus you gain twice as much 10Gi capability.
SECONDED!I really like EX3300s. Their biggest downside is that dynamic routing mostly requires a license; if that doesn't matter to you then they'd be fine. They're solid, powerful, and fairly easy to use, if you have any Juniper experience. I've never used their web UI, just the CLI.
I have a bunch of Ubiquiti hardware around, and it's okay, but Juniper is generally quite a bit nicer.