As far as the 3u rack,PC would fit in an skb 4u case with room for 1u rack audio interface. Usually play through powered monitors--rack would not include any power amps. I know the 4U rack PCs start at about 40 lbs. Thanks for taking the time to respond. I was only thinking the rack might offer me more choices and options than laptops. I know that a lot of BIAB users are quite happy with ther laptops as well. Was interested in what others are using. Thanks again for your input