Micro,
Now the plotting and planning begins - I'm sure that you'll need much more space for your home office - so building on is a must. While you're adding, it won't take much more at all to add soundproofing for that room.
Next, you're going to have so much going on, that I'm sure you'll need much much more fire power than just one computer can provide - so I'd say about 5 are in order. And to be really successful, a web-based selling site is in order - s you'll need some really high-powered video cards in those computers to do the graphics on the website justice and pretty high fire power on the cpu's to keep up with all those orders that the phenominal website graphics are going have pouring in.
On second thought - you might need 6 computers. And since the room is sound proof, there will be no need to shut them down at night so they can fold when not racking up and raking in orders and will not bother Mrs. Micro because she'll not be able to hear them and she'll be happy because of the orders . . . .
;-)
Sun :-)