Most Globaltops do 5hz "out of the box" including the ultraslim and the HUD version - and are priced close to the Holux, and use the 51 channel chipset (which maybe isn't better than 32).

http://www.buygpsnow.com/search.aspx?keyword=globaltop

buygpsnow also carries holux and has a free shipping special on the m1200