Hardware firewall & Router advice

Hi I'm looking for a hardware firewall with a built in wireless router. I do alot of online gaming and P2P (bittorrent) So I need somthing that wont run out of memory and start dropping connections when the firewall features are turned on.

I currently have a Buffalo WBR-G54 router which has served me well. But recenlty I've been having alot of signal dropouts and massive network slowdowns especially when I'm using bitorrent which I didn't have before (well not to this extent)

Any advice is appreciated

*EDIT*
As a bonus feature I’d love to be able to prioritise usage over the network so that web surfers have greater priority to bandwidth over Online gaming and online gaming will have priority over bittorrent. This was I can leave my bittorrent client always on with affecting other users usage.

 

Below is a recent thread that has some member recommendations.

This thread---> Which Router??

 

http://games.dlink.com/products/?pid=371&sec=4

For P2P,this is the only one that works apart from bridging router and using software firewall.

 

Or the new Zyxel X-550, based on the same Ubicom chip, featuring efficient QoS and allowing up to 16000 NAT sessions