Only the odd router seems to have trouble with the Pace, there was a Benq one (not wireless) that had issues.
I looked up the other device -
http://kbserver.netgear.com/products/wg602v3.asp
It has a "hidden mode" option, but it would not be usable with more than one PC, as it is an access point (with no facility for NAT addressing) and not a router.
PS. How cheap do you want....
http://www.ebuyer.com/product/132429 - thoght maybe a known brand name and a nicer colour would be better.
If the laptop has something better then ordinary G, then it may be as well to match it, though 54mbit G is plenty fast enough for broadaband (at the moment). All 802.11g devices should interoperate at G (54) speed, regardless of any nonstandard extensions.