Yup, I used once 4 satellite images at once each of about 400mb and it worked well and I have a dell desktop with 1 gb of ram and integrated graphics
. Microstation is great for 3D design but for 2D design ACAD is far better. Microstation's main advantage in 3D design (in my opinion) is that you can orbit around the model quickly and precise unlike autocad and it has that sweet accudraw pointer and you can switch drawing planes swiftly with just one button. Plus you have a lot of options for surface and solid creation and since the latest build it incorporates a new rendering engine (from Luxology) that is very fast compared to the quality of images it outputs.
I don't think microstation is that hard to learn. I learned Nemetschek Allplan in college and when I started working in this company I had to learn ACAD and after one year they switched to bentley products and had to learn powerdraft and mxroad.
Anyway dynamite looks "explosive"
but here ( in Romania) it's not a common thing to make visualization stuff for road projects so buying this kind of software it's just not feasible. So - in this conditions - Microstation is the best choice because it's actually a CAD environment with visualization modules (rendering, animation, complex shapes etc.) like a CAM software.
I'd love to work with this kind of software but ... try telling that to the managers