I can give you some points. Lets Build this. 1600$ here i come (only Intel & Nvidia Build)
Get really big hdd. i.e 2x2tB drives. I wont prefer any RAID setup. WD Black being favorite. But its upon you to get SATA 3gbps, or SATA 6gbps. WD BLACK 2tB is available only in sata2 (3gbps). not that it makes any difference. Processor (oc it of course) THE BIGGER THE BETTER! from bigger i mean the powerful. Motherboard should support all latest *** and support dv cards and all, Would be good if USB3.0 is there but its rare... GPU well well well true workstation card will require alot of money, so i will suggest Gaming ones (not that they are crap) Rams should be fast and in quantity. PSU of course would be big to power all your requirements. Casing should be Good, not beast, with good ventilation. I wont go into Cooling much, may be some else will...
Add another 2 x RAID of the F3 HD502HJs for $220: You end up with 1 RAID per track for your 'captures' and render. The Antec Nine Hundred has 9 bays --- 8 for your RAID drives and one for your SSD (don't forget the 3.5" to 2.5" brackets for mounting).
Before your 'upgrade' you will have to do 2 tracks per RAID (no biggie as it will still be twice as fast as working off a single HDD).
And I'm not sure what type of 'real time' effects you are talking about since you did not trust us with very much information on your software and workflow.