A high-end dual-boiler machine is an investment meant to last a decade, so focus on build quality rather than the latest gadgetry. Buying a machine that is easy to service at home means you only pay once instead of replacing cheap parts every few years.
Manufacturers usually run promotions in the spring to clear inventory for new releases. If you can wait until then, you can often grab last year's model at a steep discount without losing any of the performance you actually need.
This is not free money; it is a way to borrow against your future paycheck. If you have a balance left on the card once that 18-month window closes, the bank will start charging you interest on what is still owed.