I would recommand a c760 or c750 if you can just for the memory and the cpu of the c700 (I have one) 32 megs and pxa250. Can be tricky at time.
The c760 come with the bigger battery. Imo the battery of my c700 is too short (900mha vs 1900mha for the c760 ? forgot the exact number). (Of course you can buy a big one for the c700).
You can email brett at conics too, if you want something cheaper, sometime he sell used device. He can list you some he has. (Btw ordering from conics is usually really great).
Just my opinion, nobody has the same need as me