Both the Xplane and Microsoft Flight Simulator software are EXCELLENT instrument and flight training items to have. Anyone who tells you any different needs to get their head checked, or stop wearing Birkenstocks and get with the 21st century.
Microsoft Flight Simulator X is the more popular and easier interface to work in. However, they don't make it anymore, so it may be difficult to find a copy of the program in a store. However online, there is a massive cult following for that software, and no shortage of 3rd party companies that support it. Don't waste your time buying anything but Microsoft Flight Simulator X with Acceleration. The flight dynamics are pretty good, but the glass panel options are great and readily available for the MSFS product, from several 3rd party software developers - i.e. Carenado, and many others. The modifications that you can add to the MSFS product are amazing, so be careful that you don't get addicted to the sim cult, because it's really something.
Microsoft Flight Sim w/ Acceleration: $30.00
Glass panel aircraft addons: $20-$50 (Priced off
FlightSim Store and
Carenado
The X-Plane software is a little different, however just as valuable a resource for what you're trying to do. X-Plane 9 is the old version and X-Plane 10 is the new one. Although quite a bit more expensive, the user interface and setup has been given a good overhaul and seems to be easier for novice use and setup. The flight dynamics are amazingly accurate and as close as you can get to the "feeling" of flying from a sim. However, the options are limited in what is available for X-Plane 9,10 and may hinder you. Additionaly the pricepoint of X-Plane 10 is substantially higher.
X-Plane 10: $70
Glass panel aircraft addons: $20-$60 (Priced off
X-Aviation and
Carenado)
There is a 3rd option, but it's something that requires some real "need" for that level of operation. It's the
Prepar3D software platform. Based on the MSFS construct, it is the next evolution of software based flight simulation. Operated and updated by Lockheed Martin, this one will knock your socks off. But it'll run you $200.00. However, there are some real benefits which you will read about from the link.
I spent 7 years in the flight sim industry, and completed all my flight training at a Part 141 center, so if you want someone to ramble at you about the benefits of flight simulation and where to get the best bang for your buck, you just let me know. I'm happy to talk your ear off.