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Dinan would be the absolute worst bang for the buck. Completely opposite. Where did you hear that? Extremely high price, lowest power output.
On just a tune, or a DP/intake/tune, there are no reliability issues with the N55. It's completely solid even on larger turbos.
A JB4 is arguably your best bang for the buck.
That being said, but for the need to bench flash the DME first, an MHD/Wedge tuning flash (can be done via an android phone/MHD app) would be the biggest bang for your buck.
Typically, a "stage 2" tune would at least recommend a downpipe. Pretty easy install on these cars.
On a good day, an OTS tune and a downpipe could see you trapping around 110 in the 1/4. 0-60 are pretty meaningless measure, but you'd certainly be into the higher 4s.
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)
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