What do you make? What manufacturing processes do you design for?
Also Autodesk will probably give you Fusion 360 for free for a while until you are ready to commit and even then it is cheap on subscription.
Rhino is ok but will not enable you to do sheet metal or box section cut lists or simulate injection moulding, CNC machining, etc.
I would also argue the investment in SolidWorks is worth it but that said I do not agree with their price structure. I think it is shocking they still charge £4000 up front.