bill001g :
There is not a huge difference between these switches. These unlike wifi routers it is not as easy to get part lists but I suspect they may use the same parts. None of those companies actually manufacture any chips so they must buy them from someone. Switches use what is called a ASIC to allow high speed switching. This technology is so well known that there is little difference even between manufactures.
So you buy switches on features and how well the company provides support. All three of those are well known companies.
If you want my actual recommendation it is to use a switch from the HP procurve line. The features in these is very advanced and since they are used in commercial installs they tend to never fail and since they are very common you tend to get lots of sample configurations.
Be very careful to study link aggregation and the limits it has. It does not load balance by packet at best it can load balance by session so a single data transfer from a single machine can not use both connections. It is designed for one-many so that lots of clients will balance and use both connections.
Also you need to check and be sure your nas and the cpu/chipset in your computer is really designed to put out that much data. Many CPU used in desktops have bottlenecks internal to the chipset.
Thanks for mentioning the part about link aggregation limits. I was not aware of that. Oh well, I guess 1G is plenty for my workstation then. The dual NIC thing was more of a experiment. But the NAS will still be connected via LA since it can benefit from it.
The HP Procurves i have read about before, but the ones afforable to me seems to be pretty old and use alot of power (in Denmark, electricity is very expensive) and/or has a fan that makes alot of noise. Or am I looking at the wrong models?