I'm on Demon's 512K service, which as far as I'm aware doesn't have a download cap - but I've never approached 1GB in 24 hours, so can't swear to that.
Also a Netgear DG834G user, and quite happy with it now I have the latest firmware for it and for the WG511Ts in the two laptops in the house. Range doesn't seem that great, but the router is stuck in a corner of one room, which is hardly an ideal location.