If you do any work at all....it is worth spending the money on something decent.
I bought a Murex 141Amp machine some 16 years ago. And apart from a new torch and wire speed pot...it has been faultless. Absolutely worth every penny I spent on it !!!
If it broke, I would have no hesitation in spending a few hundred quid to replace it knowing the years of service the right machine can give.
I dont even use it that often now, but when you need to weld something....its just impossible to use anything else.