Feasibility: semi-autonomous (programmable) line following RC car

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hey all, new forum (and of topic in general) , have idea i'd make reality. i've done lot of searching around ideas have in mind, hoping answers little bit of in 1 place. want see if it's possible arduino boards/shields, , go drawing board.

here of specs needed...
- line following (array of ir sensors)
- speed control/monitoring (to control acceleration , speed 30mph [max] , monitor testing)
- programmable user input smartphone (app iphone app store/android market)
    - this, need it's own wifi, gopro does
- pid controller tune minimal corrections while on straight line , turns
- hooked audio device (something beep)

what arduino board best doing these things?
what shields might need?
what still need car? arduino, need besides servos, batteries, , motor?
what heck getting myself into?

i have programming experience matlab/simulink, know arduino has different language. programming skills aren't great can learn go , ask dumb questions when needed. i'm starting scratch on everything, appreciated!



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