do you already have a rangefinder?
i don't know if it's a solution for somebody that is really serious, but being a newb, i went for an all-in-one solution Sig Kilo2400ABS, so i have a rangefinder with decent range, a ballistic calculator, and kestrel like environment data to feed it. i wish i could plug the wind meter into the kilo instead of my phone, but the phone app interface is needed for specifying wind direction anyway.
i have not tested it at any extremes and i am not a competitive shooter, but it worked for me right out of the box up to 600+ yards so far.