Absolute Beginner, getting started Options

[justnicola]

hi, i'd really appreciate if you can spare a moment and give me your opinion on - what i should purchase to set up a home studio, that will provide me with hours of fun and not too much heart-ache.

aim - to produce cd demo quality
already purchased edirol keyboard pc-300
have electro-acoustic guitar, and microphone

what i need your opinion about : the 'get-up'
sequencer: what do you think is easier to use - cubase or logic
computer : will ibook do the job, or do i need to get powerbook ?

any advice wil be most appreciated
thanks - nicky