I like my PDA, I don't want a big phone. Take a look at ebay something like this
eBay.co.uk: HP/COMPAQ IPAQ RX1955 1950 POCKET PC/PDA SEALED ~WARNTY (item 140007315015 end time 19-Jul-06 23:00:00 BST)
If you want to run satnav you will need a bigger memory card, but I bought a 1gb one anyway which will hold just about anything I need to put on it.
My TomTom navigator5 cost me £99 again from eBay came loaded on a card.
I have added Vplanner, my Alladin Travel trak, Nigel's gas blending programme and still loads of space.