If you get regs first then then you might have an inflator hose incompatibility and have to swap out. Also if you should decide on a BCD with it's own regulator you won't need the octopus that comes with your regulator set.
If you can't afford to buy both then buy cheaper and used and match them up. Nothing wrong with good, serviceable dive gear but you might need to run it by a tech before using it.
If you can't afford to buy both then buy cheaper and used and match them up. Nothing wrong with good, serviceable dive gear but you might need to run it by a tech before using it.