Buy a machine for the long term not short term.
If its a 300psi machine then it should be adjustable down to 100psi. But its technique that overwets not pressure. Get on a training course before you buy.
Regarding CFR wands, try before you buy as their a different ball game altogether.
My advice is a machine that has 2x3 stage vacs, 300+ psi with adjustability, heater element, silencer, big wheels, plastic body.
Ive a Ninja and would recommend it as being the best two cord machine available.
Mark