1095T would definitely have the advantage when the multi core comes into play. But the i7 wont be far behind because of the HT and Turbo Boost, its pure muscle when comes to processing. The i7 has 4 cores alright and 8 threads. Don't know how many cores can the softwares you mentioned utilize fully. That would be a factor in deciding which proccy to go for. So i would say the Thuban on this one.
You can think about the Gulftowns but they ridiculously high priced!
as I know, for example Fluent can use 4, 6 or more cores