And just to repeat what I've said before on these threads - if the weight of a machine isn't an issue, vintage Singers, Jones, etc are a very good buy. I've paid around a tenner at car boots for them. They are far better engineered than modern machines - very little to go wrong on them, and loads of YouTube videos and blogs etc to tell you how to clean & maintain. Spare parts easily available and very cheap. They only sew forwards and in a straight line as a rule, but many come with - or you can get - attachments.
I do almost all my sewing on a 1956 Singer 221K (Featherweight) which is a miniature machine that many think has the best straight stitch ever. That one can go backwards as well - which many vintage machines can, post 1940s.
My machine was re-wired and serviced before I bought it on eBay and came with most of its original attachments, spare bobbin and a carrying case. I've had it since summer and have made about a dozen dresses on it, a set of caravan curtains, new living room curtains, some cushion covers, two coats and currently am making a dressing gown - it's a really, really fun machine to use. A reconditioned 221K might set you back around £150 (they can go higher) but it is bombproof and will never let you down. Also it doesn't make the horrendous noise of many modern entry level machines.
I have hand cranks and a treadle as well. All incredibly straightforward and as they were engineered to do only one thing - a straight stitch - they do it incredibly well.
My newest machine is a 1970 Brother (my mum's) which does zig zag and loads of fancy stuff etc but if I'm honest I prefer my own Featherweight. They are being snapped up by Americans though and will get harder and harder to find as quilters rave about them.