I think Ian is dead on. Do some research with the graphics your customers currently want. A 10-color press provides you more options... but you have more setup related costs. Most of the companies that I have done work with that have been doing screen printing do not stop it, but only add
dtg printing to complement the screen printing. I would hate for you to sell your screen printing equipment to get a
dtg printer (no matter which brand) and then not be happy with the colors / hand / production speed. So take your time when making this decision and do as much research as possible.
Just my opinion. Best wishes,
Mark