Looking to upgrade (finally), but first...(about port forwardig)

I've got a (fairly) old Airport Extreme (Snow) base station. Most of the computers around the house are new enough to have the "n" airport cards in them, so I'm looking to upgrade to a new base station that support this.
One of the pet peeves I've had for a while is that the base station that I currently have (snow) gives you extremely limited possibilities for forwarding public ports to specific machines. It limits you to 20. If you try to enter in 21 ports to forward to any particular machine, it gives an error and will not let you reboot the station.
Does the current Airport Extreme Base Stations have this same limitation? If not, I'll just buy a different wireless router that does and pay the couple of bucks Apple charges to unlock the wireless card instead.
Has anyone been able to forward more than 20 ports to their computer using the current base station?

I've got a (fairly) old Airport Extreme (Snow) base station.
You either have a 802.11b dual-Ethernet (aka snow) AirPort base station (ABS) OR an 802.11b/g round AirPort Extreme base station (AEBS). The snow ABS and AEBS are totally different animals.
KB 107908, Identifying AirPort hardware
The new AEBS allows ranges of ports to be forwarded which makes life simpler. I also believe that the limit of 20 no longer exists.

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