Ahh the Ken D. Webber jokes will never stop
Expect to spend $1500 on your computer w/monitor and nice soundcard (NOT including software). Whether you NEED an outboard mixer will depend on your soundcard selection and personal preference.
You might spend more, you might spend less, but $1500 is a good figure for a decent DAW. That will leave you with $700 left over for your mixer if you want one.
I won't even begin to tell you what you need as far as a mixer, but I some guidelines for the computer would be:
Intel Processor. At LEAST a Celeron 400. A PII 350 or better or PIII is preferred. The Athlon chip by AMD is pretty good, but the support for its chipset(s) is not as good (yet).
128MB PC133 SDRAM. Don't get any less than 128MB and don't spend more than $130 on it. (e.g. you don't need ECC & registered memory for a DAW)
Look for a 7200RPM ATA/66 hard drive with a 2MB cache. IBM and Quantum make good drives that work well right out of the box. Avoid Maxtor and Western Digital.
Your motherboard selection is important. Get something upgradeable & without ANY integrated components.
A 17" monitor makes life much easier.
Windows NT Workstation 4.0 or Windows 2000. Don't suffer with Windows9X...it's just not worth it.
That's basically all that's really *important* in a basic system. You will have to determine your needs when selecting a soundcard and mixer.
Slackmaster 2000