Ernie,
I wouldn't worry about the game port.....use the USB like you planned....you won't have to worry about getting the Tx to work...it's plug and play. Make sure your PC is up to snuff with the requirements of G2 also.....I would probably go with the full blown G2 instead of G2 Lite....if you order from Tower Hobbies, I think you can get G2 for about $199, plus you get a $20 gift certificate for your next order.......plus I think you can save an additional $10 or so with a coupon (check their website)
Once I upgraded to G2 it was like a completely new simulator compared to the Classic.......the online multiplayer option is a lot of fun!

Mike