We were also advised to use the Evance turbine. The Kingspan KW6 is similar but has a higher cut-in speed which makes a big difference to total generation.
If you want to go down the Feed In Tariff route, everything must be done by an approved MCS contractor. If you aren't looking to be paid to generate, or to export, then you can do whatever you like.
With wind, everything comes down to getting a good average windspeed. You can get a rough idea by looking up the NOALB database which will give you an indication of the expected average windspeed for your location. 5m/s is the generally accepted cutoff for viability.