funfly58,
Your Conquest will be fine for a long time to come. While having a few of the features available in a computer radio is nice, especially "End Point Adjustment", it's certainly not a necessity.
I used the same Conquest transmitter for my first 4 or 5 years, and found it very reliable. Stick with buying "flight packs" until you feel that the computer transmitter will really be a logical move for you. Then, you can buy the transmitter alone and save a couple bucks.
Having said that; price "flight packs", then price simple four channels radio sets. You'll probably find that you can get the extra transmitter, charger, switch harness and battery packs for very little extra money. If you don't want it, you can always put the additional transmitter on an auction site and most likely get back the price difference.
Welcome to RCU!
Dennis-