All laptops I've used have terrible microphones and not so good analog audio inputs. I'd skip that for audio capture and use things like http://www.amazon.com/Zoom-H1-Portable-Digital-Recorder/dp/B003QKBVYK or better.
You still can get great laptops so why not the really nice MacBook Pro and GarageBand?
My old laptop is dying and my tax refund is coming(yay!). I've got abut $2200 to work with. I am looking for a new laptop and I would like one that would be suitable for recording music in my home and maybe in a live setting. I would love some suggestions as to which laptop you think would work for this.