Digital Press Advice

Hello,
I work running a four colour Heidelberg GTO52 circa 1983 in an in-plant.

We are at a crossroads as to which way to jump in respect of digital or whether to stay fully Litho

Our work consists mainly of up to 100k runs on the 4 colour and we also have a 2 colour GTO52 that does all the stationery and final (up to 3) spot colours on in house packaging which is mainly 6 colour (4 process + 2 spots)
the runs for the packaging usually self adhesive stock or 180gsm one sided board runs of 50 to 1000

We also have a Heidelberg direct to plate system that is circa 2003 and starting to feel it's age

the management here hate the idea of click charges and being tied in with anything

We could in theory go fully digital thus no need for the platemaking process at all or change out the 2 colour

My question is do we just change the 2 colour GTO for a machine that will do up to 7 colours and is this much more expensive than say a four colour digital machine

Spot colours need to be pretty good as it's corporate image

we are just not sure which way to go with it and asking any of the manufacturers will always say that 'their' solution is best

any thoughts would be greatly appreciated