Well a decent router that's cheap is the Asus WL-520GU. (currently $43.72 free shipping with a 10 dollar mail in rebate which comes out to $33.72)... also has a detachable antenna so if you want you can get a different one.
which is what i got and it has a USB port which you can even connect hard drives to if you install DD-WRT firmware to it which is the first thing i would do when you get the router.
"dd-wrt.v24-12548_NEWD_mini_usb_ftp.bin" ... that's a good version to use as it's been throughly tested. they do not recommend the official v24 or v24 SP1 builds as that is considered better. there is other slightly more recent builds that are recommended but i am staying on that build since it's stable and has USB and FTP support.
not sure if that's what your looking for as the WL-520GU does not have Wireless N stuff.
just some thoughts.
p.s. it appears DD-WRT supports the "NETGEAR WNDR3700" (which is in that link above) of DiiZzy's.