discountedheating -
What, so because they might cost more in a few weeks time that means that the price you pay now, today, isn't real? They've been at this price for at least 6 months.
Have a look at the documentation for the CM67NG RF - Honeywell have taken steps to reduce the impact of RF interference in the new generation by reducing the time taken to transmit from stat to receiver, and by using a 0-100 scale of demand rather than on-off.
With the older model, if the receiver missed a command to turn the boiler off, it would stay on and over heat the house until it regained contact with the stat. Now, if it misses the command, it would stay at (say) 25%, and control the boiler accordingly, until it starts to receive again.