ok then... pretty much any router should be able to act as a booster. preferrably of the same brand as the other one tho. but any can still be used. it just needs to be setup correctly in the same IP range etcetc.
but it does depend on what router you choose. read up carefully before choosing something,
If you are looking to extend a "g" network, you might just consider purchasing an "n" router instead of a g extender. N is advertised as typically having a 4x range advantage, and n-compliant devices get a major speed boost.