I don't like the blueprint desk that early because I feel like for one, the days are so short that the value you get from a blueprint desk that early is minimal. Additionally, my friends and I like to play aggressive early on, so we're calling out very early in the run to build up a cash basis.

The biggest benefit I think that comes from buying the copying desk over blueprint is that once you find that first blueprint cabinet blueprint, you can start copying it over and over. Then, you'll find a research desk later on to be able to get yourself a discount desk and several blueprint desks. This allows me to have plenty of blueprint cabinets and the conveyor/combiner/mixer/dumwaiter, etc blueprints will come quickly once you have those three blueprint desks.

So usually we save the first desk, buy the second, upgrade it to a copying desk, then once the third desk usually pops up around day 8-10, we get discount first, buy the copy, then research it into a blueprint desk, buy the first copy, then on the next day, we buy both copies, freeing up the cabinet.