Check and see if there's a rebuild kit available for your old one, first. Lots of pumps have them available for $10 or less. Your LBS would probably have to order it in, but that shouldn't take too long.
My Serfas TCPG has been fine ... but they don't offer a rebuild kit. When it starts to wear out I might even check whether another company's pump heads and/or gaskets might fit it. I'm also needing to rebuild my Spec' Air Tool Comp (might not have to do that so soon if I hadn't been using it on both Schraeder and Presta valves) - rebuild kits for that are $3 I think.
"I felt [the women's Olympic marathon] was as important as women having the right to vote, because talent, strength, and capability cannot be fully realized if there are no personal rights to allow them to be visible or be deemed significant in the first place." - Kathrine Switzer, Marathon Woman