I'd say that's a good plan. You'll see minimal gains on the track with any set of springs, IMO. My dinan stage 1 made very little difference if any. I would think about adding camber plates.
I think the OEM suspension is very good. If you want a significant improvement, you need to get new dampers.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red