Looking to buy a professional torch

I got interested in metal fabrication through my hobby working on an
antique British bike. ( they keep you busy). I had done lots of
welding and some sheet work but I got hooked on the idea of bringing
metal to complete liquid state. So I started casting and soldering
things using delft clay and a basic gentech little smith torch and
used disposable tanks. For the past 2 years I have had some fun and
success but want to buy a professional torch. For centrifugal or
steam casting silver gold or bronze up to 3 ounces max should I buy a
complete little torch kit or should I buy a presto lite or etc. ?

I want to build a workshop in my garage based on hobby level casting
and fabrication.

I don’t have and problem with a two tank system.

I appreciate any advice.