The ASUS A636 and A632 are the first Windows Mobile 5.0 Pocket PCs with integrated GPS to hit the US market. Accordint to the MobileTechReview article posted couple of days ago.

" We'll take a look at the full-featured A636 which offers the SiRF Star III GPS chipset, WiFi, Bluetooth, an SD card slot, 256 meg SD card with Destinator navigation software, Destinator PN navigation and mapping software on two CDs (US, Canada, Route USA) and a brilliant QVGA display (the A632 is the same but lacks WiFi and adds a mini SD slot)."

For sure this will be very relaiable device and if you are looking for GPS handheld those ASUS MyPal A636 and A632 would be great choice. If you are more in the GPS phones then you may take a look at the Mitac Mio A701 / A700.

We've recently posted an article regarding GPS receivers guides and explanations which you may find interesting.