If its just for sat nav.. and money IS an issue.
1. Dell AXim X30 (No WiFI/Bluetooth) £152 From dell
2. Seidio GPS2500 amplified car holder + Wired GPS from
www.seidio-europe.com £96
3. 128Mb SD Card - £15 from anywhere
4. TOMTOM3 £95
So thats £263 without TOMTOM3 or £358 with TOMTOM3.. I bought TOMTOM, but I noticed some guys in work had downloaded it from the usual P2P places.. (not sure how updates work, but they reckon they had the latest 3.03 version, which I've only just upgraded to)
The main strength in this setup is the GPS2500 mount, its amplified, so no problems hearing it, and is moulded to the PDA model, so you just slide the PDA in, and its all connected, and looks good.
www.pocketgps.co.uk have just reviewed it.
The dell X30 has a very good IR transmitter that means you can use the PDA as a remote control for all your Home Cinema stuff..