ok yes GPU acceleration is almost always better by around 5x to 20x faster than purely CPU compute if it is implemented in the software of course.
Are you going to be making and/or reading from Blu-ray disks now and/or in the future?
How long do you plan on keeping it?
Also how upgradeable do you want it to be as are you going to build / make another Workstation when this one fails you or are you going to upgrade it?
I also ask as your price point of $1,500 to $2,000 is kinda low for a workstation for your needs. Sorry to say but what you ask for will work alot better with a higher end build but $1,500 to $2,000 is ussualy the starting range of gaming rig while a workstation because of just the parts needed for a standalone computer starts about at $1900 and goes up with more peices so here is the bare minimum computer which i could shove into that budget of course feel free to modify and edit upwards but i do suggest not going downwards due to your applications running alot slower.
So here is what i came up with as a base line build for a workstation
PCPartPicker part list:
http://pcpartpicker.com/p/jvBwjX
Price breakdown by merchant: http://pcpartpicker.com/p/jvBwjX/by_merchant/
CPU: Intel Core i7-5820K 3.3GHz 6-Core Processor ($299.99 @ Micro Center)
CPU Cooler: Cooler Master RR-T4-18PK-R1 70.0 CFM Rifle Bearing CPU Cooler ($19.99 @ Micro Center)
Motherboard: Asus X99-E WS SSI CEB LGA2011-3 Motherboard ($481.98 @ SuperBiiz)
Memory: Crucial 16GB (2 x 8GB) DDR4-2133 Memory ($192.98 @ Newegg)
Storage: Western Digital Red Pro 4TB 3.5" 7200RPM Internal Hard Drive ($226.99 @ B&H)
Video Card: PNY GeForce GTX 770 4GB Video Card ($284.99 @ Amazon)
Case: Rosewill RISE ATX Full Tower Case ($81.56 @ Amazon)
Power Supply: Corsair 760W 80+ Platinum Certified Fully-Modular ATX Power Supply ($183.99 @ Amazon)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($14.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 Pro - 64-bit (OEM) (64-bit) ($129.94 @ OutletPC)
Total: $1917.39
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-12-13 22:18 EST-0500
it barely comes under how much the top of the budget is but has room to upgrade alot in so you will not have to build another computer when your needs become larger. Room for a M.2 drive if your needs require more hard drive speed, enough SATA connnectors to hold 9 more hard drives so you will not need to buy another computer for storage ... unless you want to make a cheap sub-$1,000 NAS for network storage which really should be done instead of a more expenive workstation but i am not you, also upgradeableity to better CPUs of Core i7 and of Xeon CPUs so if you need more CPU cores it currently can support up to 14 physical cores with hyperthreading. RAM goes up to 128GB unlike many other boards which only support upto 64GB, and many other options for upgrades in the future.
THIS IS ONLY A STARTING POINT not a ending point as it is a lower end build for a standalone workstation but can be upgraded to be a very good one. I will not suggest gaming on it but if your work demands testing your files inside of runtimes alike to games it will handle it fine. I put in enough for it to be a all around decent workstation and suggest if you want more than just this start looking at off loading to servers as that will be cheaper to do.