Hey chick
It really depends on how much you want to spend. If money is no object, then you can buy proper plane controls that plug in via USB. I'm talking separate throttle panels, separate rudder pedals and control yokes. That is an expensive way of doing it though.
If you're on a bit more of a budget, google for the Saitek X52. This is what I use and it's pretty good. It's still about �85 though
Going further down in price, look for a joystick that has a throttle control, handle twist (for rudder) and a fair few buttons. I used to have a Logitech Wingman which cost me about �25.
As for true dynamics, I'm guessing you mean flight sims. If so, then the only one worth bothering with is Microsoft Flight Sim. Depending on how new and powerful your computer is you can either run Flight Sim 2004 or Flight Simulator X. X is the newest one, but to run it properly requires a meaty PC. Both FS9 and FSX have the same flight models though so there is no difference in terms of flight dynamics, just different and nicer planes to look at.
Hope that helps a bit