When you say "bang for buck"...I have to give a shoutout to Clear View.

While its not the best one out there...it does a lot for 40 bucks.  Add to that about 20 more dollars for a cable to connect your own TX to your PC via USB...cant beat it for less than 60 dollars total investment!

Note:  You can use a MS joystick (the one that looks like a PS2 controller with the two thumb sticks on it) for Clear View (and probably other SIMs too).  I prefer to use my own TX so I can gain that "feel" of the gimbals as I practice.