You can go all in and buy Logic it is a very rich Mac DAW for around $200. http://www.apple.com/logic-pro/

Or go with Studio one, a little less Midi tools but still pretty solid and a great value, and deep Melodyne integration. http://www.presonus.com/products/studio-one Artist is $100 only limitation is no third party Plugins, but what is comes with is really pretty good, or Producer $200 and it opens up third party plugs, then the Pro version for $400

Of Reaper for $60 solid program, midi is growing in it, still not up to the others midi wise, but far more than Garageband http://www.cockos.com/reaper/

HP Win 11 12 gig ram, Mac mini Sonoma with 16 gig of ram, BiaB 2025, Realband, Reaper 7, Harrison Mixbus 9 32c , Melodyne 5 editor, Presonus Audiobox 1818VSL, Presonus control app.