Hello and welcome from me too. Enjoy your sewing.
I see that you are up in Norwich, now there is a shop in Kings Lynn run by a member on here called Machine Steve, so why not treat yourself to a trip to Kings Lynn and just see what he has to offer in the way or sturdy older machines, i.e. those taken in part exchange, and also have a look at the more modern machines which I think you will find for your budget rather inadequate with regards to the weight of the machine and thus likely to move around the table. In the past I have read from others on here that Steve and his staff are excellent, will listen to what you are wanting and help you decide what is best for you.
May I wish you well in your quest.