But I've ordered the SPV C500. Managed to get £50 for my V600, so that brings the price down to £90 which is more acceptable for a phone that will last me 6 months or so and with the rumours of the WMP10 firmware update around. Still got to pay to unlock it as I'll be using it on O2.
Gone for a 1GB Mini SD card, which I can also use to boot my Tablet if the install ever goes south - without buying an external drive, or messing around with a network install.