Yup just go for a TT1 mate. I get to play with garmins/tt/medion/garmin at work and the TomTom's just flat out work the best. Theres a reason they're the market leaders and thats they're so easy to use, and they just work!
Now the TT1 is easily available at about £150 theres really no reason to go for a cheaper unit, you will only regret after a week of trying to use the navman/garmin/medion.
The newer garmins are the only things close to TT atm and they're atm more expensive, and imo not as intuitive to use still.