suggestions on office workstation

Mga Sir/Mam,

Any suggestion on Office Workstation? Right now we are using Dell Precision T1600, http://www.dell.com/downloads/global/products/precn/en/precision-t1600-spec-sheet.pdf

I would like to ask our experts, would it be possible to have an PC upgrade (buying new one-assembled) or just add ram and change the video card of the existing workstation (the current only have one dvi output, were planning to use two monitors for viewing/operation flexibility)?

The workflow of software we are using are AutoCAD, Sketchup Pro 8 and 2013 with Layout + Twilight rendering plugin, and sketchup animation output 1920x1080p then 3d max with vray, photoshop, browsing the internet.

Salamat in advance.

buy a new one, adding more ram and upgrading to higher videocards is a good idea but for me it only make sense in a home use upgrading, but for a company who has budget for upgrading, better buy a new set, besides one big reason of computer slowing down is its years of usage.

dont buy branded computers, its a more expensive pc but does not beat a customize computers in terms of price and specs.
select the best specs according to your need and let the store assemble it for you. 

salamat sir oby

Sir, Look for 2 in 1 dvi output & add another RAM. Instead to buy another, Just try one workstation before doing everything.

tingn ko bosing as of now.. the BOXX for still best in our work. kung sa company naman why not diba. kahit mejo mahal..http://www.boxxtech.com/

salamat sa mga response sir dongding and sam007.