Lumion 3D doesn't work. Need to change graphics card. Need help!

[Yero]

Hello I need help choosing a right video card based on a current situation and budget

Here are current computer specs. This build was already put together and works

Intel Core i7-3930K 3.2GHz 6-Core
Corsair H60 54.0 CFM Liquid
ASRock X79 Extreme4 ATX LGA2011
GeIL EVO Veloce Series 16GB (2 x 8GB) DDR3-1866
Samsung 840 EVO 250GB 2.5" SSD
Seagate Barracuda 2TB 3.5" 7200RPM
NZXT Tempest 410 ATX Mid Tower Case
EVGA 750W ATX12V / EPS12V Power Supply
Microsoft Windows 8 (OEM) (64-bit)

This build is used for Architecture school. It's been performing well until recently.

Problem is that we have to use a program called Lumion 3D (www.lumion3d.com), which from what I understand benefits from using a graphics card.

Currently I am using a cheap ~$30 graphic card just to connect monitors. As a matter fact I installed the software and ran it. It started performing it's benchmark test. Which is a video being rendered. It is very slow and never finishes it.

I am looking to invest in something that is going to make Lumion 3D work. I don't want a workstation graphics card like Quadro or Firepro. I am looking to spend $200-$300 maximum.

If you anyone can find a solution I would really appreciate it.
Thanks!

 

[Avro Arrow]

Well, it looks like you're going to need a Radeon card because their GPUCompute capabilities far exceed those of GeForce cards (which is why the LiteCoin miners are buying them up like crazy). The HD 7870 should do the job well and it's priced beautifully.
Radeon HD 7870 - $190 (-$30 mail-in-rebate)