I have a BOSCH "Classix" SRS43C12GB slimline dishwasher, excellent machine, does what it says on the tin with no fuss, extremely quiet and makes a great job of the dishes....also being a slimline model you would think that equals little space inside , but I can assure you that it takes most things easily and does a great job!
Also the controls are simple, non fancy and gives a wide choice of programmes to use. I find the ECO 50oC washes as well as the main 65oC wash, there is also a quick wash for lightly soiled dishes. Its a great machine, solid and reliable....worth every penny!
I would recommend that you look at these forums before you decide though.....and I would steer you away from Hotpoint/Indesit
If you want to find the cheapest one do a search for the model on www.Kelkoo.co.uk
type in Bosch SRS43C12GB and you will find the cheapest price, currently I found it retailing for £231.99 including delivery. Remember also that Bosch appliances come with a 2 year guarantee and are very reliable machines overall with great service if anything should go wrong