For the Laptop, the fastest processor and as much memory as you can afford, cos the maps will move more smoothly.
Software:- Oziexplorer is an excellent program with many features, I use it just about every day for planning NAVS, debriefing and so on. There is even a 3D addon for about A$40.00 that looks kind of cool.
Check out the link above, you could be impressed.
No I dont work for Oziexplorer, but am happy with the product.