Wireless cable router wanted..

[Mark]

WRT54GS routers are only supported by 3rd party firmware up to revision 4 (the current revision is revision 6). D-Link hardware isn't supported at all by 3rd party firmware.

The reason for looking at 3rd party firmware support is because this firmware allows you to turn up the output power and also supports client bridged and WDS modes (which will be very useful to you and which a lot of routers at the cheaper end of the market don't support). If you do not feel confident about flashing the hardware or do not want to (it voids the warranty), then this isn't an option for you anyway.

The other option you could look at is to get a pair of outdoor directional antennas and point them at each other (one on the house, one on the shed). This will allow you to get whatever router you like (providing the antennas are detachable), but the antennas themselves can be expensive as you need special cables as well as the antennas themselves. This option does not solve any problems you may have getting the routers to 'talk' to each other.