Of the bikes mentioned, the Jake tends to be the best bargain in the UK. Whichever one buy, have the store swap the pre-cut straddle on the front brake for a hand cut one and have them fit a fork mounted canti hanger. Or do it yourself. (Cross bikes have one bad habit - squealing and under-powered front brakes. This is the result of a decision by manufacturers to de-ball them for legal reasons.) Search or ask on the cross forum if you more help.

Don't forget that your experienced of test riding a crosser will be heavily biased by the tyres it has fitted; all things equal the more they are suitable for off road the worse they will ride on it.