@calico the only dealer that I know of is in Ballymena and they do Singer, Pfaff, Elna & Janome according to their website. You can get a train.
You'll read on here "I have no shop...the closest one is 30,40,50 miles away. When we say we have no shop...WE HAVE NO SHOP! The end.
With that budget I'd be tempted to go to the mainland and visit one of the big suppliers (SMD) over a couple of days. I'm sure someone must have done that. Good luck.
And if you hear of any dressmaking classes would you let me know please. We have none of those either.
I live in Belfast so a bit of a trek though being over 65 I get free bus and train. I`ll maybe give them a ring or if they are on face book to see what they stock . I keep coming back to the Janome MC6700P as I rarly use a free arm and anyway my Elna has one.Also as BrendaP sugested I could stretch to an additional overlocking machine though I have never used one before.
Our womans group , now gone, set up a craft class years ago with a tutor from the tec . I believe some of the ladies did their City and guild cert via it. Unfortunately the sewing machines seem to have gone now and the group have diversified into card making . Did you try the colleges or perhaps local womans groups for classes ?