Why are you buying instead of hiring a professional PSM? Or at least renting? Are you going to be running it or handing it off to someone else?
Quality gear does not guarantee quality sound. Great sound is also very much about knowledge, skills and technique. All that great gear will do you no good in the hands of whichever PA isn't busy the day of your shoot.
Anyway, to answer your question:
Rode NTG-3 shotgun - $700
Audio-Technica AT4053b Hypercardioid - $600
Rycote Windshield w/Dead Cat - $600
Boom-pole - $400 to $800
Tascam DR-701D 6-Track w/SMPTE - $600
Zoom F8 8-Track - $1,000
Tascam DR-680MKII 8-Track - $600
PSC DV PROMIX - $350
Sound Devices MixPre-D - $950
Case for Mixer & Recorder
Approx. $350 to $650
Sennheiser G3 - $1,150 - (x 2) $2,300
CountryMan B3 - $180 - (x 2) - $360
CountryMan B6 - $350 - (x 2) - $700
Sanken COS-11D - $475 - (x 2) - $950
Tram TR50 - $250 - (x 2) - $500
Sony MDR 7506 - $100 - (x 2) - $200
You'll also need a bunch of other accessories - batteries and/or battery packs, cases to carry/protect everything, etc.
I haven't added it all up, but somewhere between $6k and $8k.
If you want REALLY, REALLY solid advice about production sound go to:
a forum for production sound professionals.
But read this first: