About those cables that are advertised as SATA 2 or SATA 3 - There is no difference. There is only one international standard for a SATA cable that is used with standard desktop ssd's. Labeling a cable as SATA 2 or SATA 3 is just an advertising gimmick.
I've had very good luck with Orico ssd brackets. There is one particular model that allows me to install two desktop ssd's in one standard 5.25 inch drive bay. I install them in pc's I build for clients. I see you are not in the USA. Luckily the Orico brackets and drive bay adapters are available in quite a few countries.
I normally recommend Samsung solid state drives. Samsung has an excellent track record. Intel and Plextor are also worth considering. Just about all of the modern 3rd generation, SATA 3, 6Gb/s, ssd's form a very tight performance cluster. A human being sitting in front of a pc will not normally be able to tell any performance difference. The only way to distinguish very minor performance differences is by running ssd benchmark utilities which are designed to grossly exaggerate those minor differences.
The new "sweet spot" which represents the best value for the money is a 256GB ssd. Due to price reductions and current holiday sales, a 256GB, SATA 3, 6Gb/s ssd can be purchased for $149.00 to $179.00 US Dollars. That works out to a price range of £90.89 to £109.19. However, it is my understanding that prices outside the USA tend to be higher.
I maintain the ssd database listed in a sticky at the very top of this forum section. Here is the link:
http://www.johnnylucky.org/data-storage/ssd-database.html
Scroll down to the brands and models you are interested in and follow the links to the technical reviews for detailed information about each model.