$3200 Workstation build needs work, my first build, grateful for help

[caesparktom]

Ok, here is my workstation build as it stands. I hope this forum can help me eke out some performance and give the price a shave at the same time. I'm no expert, so please take me to school. I included prices because i am buying locally in beijing, and cost and availability is not the same as newegg, etc. -Thank you for help

about usage: I mostly use rhinoceros, autocad and cs5. I model more than render, but do like to leave one of my viewports on live render. More concerned with responsiveness than with any desire for my rendering to be complete before i've had a chance to refill my coffee. Oh, and i typically have a a handfull of very heavy files/applications open at same time, as my workflow involves alot of importing and exporting and simultaneous use of different software.

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Approximate Purchase Date: this week if possible, maybe next week
Budget Range: 3000 usd
System Usage from Most to Least Important: Rhino, Autocad, CS5
Parts Not Required: -
Preferred Website(s) for Parts: Will buy all components from beijing computer market
Country of Origin: China
Parts Preferences: see parts list below
Overclocking: nah, Bad idea for workstation I hear
SLI or Crossfire: doubt it
Monitor Resolution: 1920x1080
Additional Comments: -
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$3200 BUILD:

mobo: SUPERMICRO X8DTL-i_$430.23
CPU: 2x Xeon E5620_$460.96
GPU: NVidia Quadro FX 1800_$453.28
RAM: 2x 4GB/PC3-10600/DDR3 ECC_$222.8
SSD: Crucial C300（64GB）_$153.5
HDD: Seagate 1T 7200 SV35.5 SATA 3/32M_$84.51
DVD: Sony Optiarc AD-7240S_$30.58
LCD: LG W1942S-PF _$136.44
Key: K120(Logitech)_$7.53
Mouse: M90(Logitech)_$6.91
Case: Corsair 700D_$261.06
PSU: Corsair HX850_$261.06

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Particular Questions:
- General opinion of build performance/compatibility/balance
- single i7+Quadro 2000 vs multiple xeon+Quadro Fx1800
- Advice on cooling. what to use/ will fans be loud as h or not too bad?
- supermicro vs intel mobo for xeon?
- Crucial C300 vs Intel G2 SSD

Thank you for help

 

[caesparktom]

Update:

MOBO:
Narrowed down to the SUPERMICRO MBD-X8DAL-i or MBD-X8DAi. DAi has 6 more memory slots and 1 more 32bit PCI slot which i won't miss and also uses the 5520 chipset instead of 5500. Any good reason to opt for 5520 over 5500 chipset?

HDD:
possibily switch to:
WD 600GB 10000 SATA3/32M（WD6000HLHX）

SSD:
switched to Intel G2(80G) then back to the CRUCIAL C300(65G).

FANS/COOLING:
still have no idea what i need.

CPU & GPU:
need some advice