The problem is every one will give you a diffrent answer.
You need the best machine you can afford. Look at Scorpion, Ashbys, Prochem, CFR Extracta,
If you use the serach facilities you will find lots of comments on all of them.
Another Factor could be where you live, who is the nearest supplier who can repair machines.
Do not forget Marketing and finding Customers is expensive.
I am told it is harder now than 10 years ago.