Heard of Netgear’s open source router - WGR614L? The specifications are similar to that of WRT54GL (16mb RAM, 4mb flash) but WGR614L is using the newer Broadcom processor. Other than that, its specifications are similar to that of WRT54G and DIR-300:

• Wireless G
• 4 x 10/100 LAN
• 1 x WAN

I really like the slim design of the WGR614L and most important of all - It supports 3rd party firmwares (dd-wrt, tomato, openwrt)! The WRT54G supports all of the 3 mentioned firmwares while the DIR-300 supports dd-wrt and openwrt only.

Got to flash it to tomato and set it to filter some protocols on some segments of my network.