I've got a dedicated Music computer. It has BiaB, RB, Sonar etc and only music related software applications, nothing else.
Runs Windows 7 Professional.
It starts fast, and never gives an ounce of trouble.
All music data is on a 1TB drive. (I won't worry about a bigger one until I fill this one.)
BiaB is installed on E: but the Audiophile files remain on F:
Intel Core i7 CPU, 16Gb RAM
Dell widescreen monitor
Sure, you can get bigger and faster but this unit does absolutely everything I need.
Hope this helps
Specs are below

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BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones