Hi, I'm looking into getting a Philips Pronto at some point but I'm totally confused by the model numbers! I can't work out what the latest models are and which ones are the older models. Also, I get confused because some are called 'RU890' or something similar while others are 'TSU7000'. Do both of these codes make up the model number or is one UK and one US? It's particularly confusing looking at ebay because there might be one model (e.g. an RU890) going very cheap while there's another one going for £200+ so I guess there must be some differences in age and functionality! Any clues would be great so I know what to look for!