Hi,

As you probably already know, the main component for pro sound will be your sound system... speakers and amplifier. Your Laptop speakers will never give you pro sound no matter how much you spend on other gear.

For an inexpensive laptop setup I would recommend a USB Audio interface (Edirol or other brand) preferably one with a standard midi in/out feature just so you have it if you need it later.

Then use the USB Audio device out to a good set of powered monitors. (KRK, Roland, M-audio ... on up to studio grade. Even the cheap ones are pretty decent.) There are even USB powered speakers available now. I don't know how good they are.

Your built-in sound card will be adequate for the audio. For the Midi sounds, I would suggest that you try the included DXi or VSTi (Roland) Virtual Sound Canvas that comes with BB first, before you decide to get something different.

I also recommend getting the Real Tracks versions if you can afford it. I just bought the Audiophile HD version this week and couldn't be happier. Some midi sounds are usable, but I will be using the Real Tracks for the most part. (So what I'm saying is spend your money on the Real Tracks, rather than on a different midi sound module.)

Finally,

You don't need a piano/synth keyboard unless you need it to perform on. If you're a keyboard player you'll want one. If not, you don't need it. Entering chords in BB is easy. Get a USB mouse if you don't want to use the trackpad. (I use a $25.00 Logictech Trackman Wheel. Highly recommended.)

Hope this helps,
Dean