Starwolf - I think you are mistaken on the power set-up of ships. From what I have seen, the weapons, shields and thrusters draw power from their own independent systems. Shield recharging will never draw power from weapons or thrusters and vice-versa.
The power rating of the ship tells the optimal class of weapon or system it can use, and the max power is the highest class of item you can use on the ship. Using optimal class weapons, and thrusters will result in hardly any power drain (or slow down of shield recharge rate for shields). If you use the max class of equipment, you will see a larger drain on your systems.
Balrog - It's my understanding that with over 30 ships availiable and 160 weapons, shields and thrusters, you don't need to worry about the little stuff. Instead of buying better armor, gun coolers and cargo bays for your ship like you did in Privateer, you just buy a better ship. The higher the class of ship, the more power, armor and cargo space you have! Personally, I'd rather have 30 ships to choose from rather than 3 ships with more junk added to them.
Something else to look forward to (but I don't know if it is really true or not) is that I have heard rumors of secret items: like a unit that will jam scanners from being able to see what is in your cargo hold, and various weapons, thrusters and shields that cannot be bought. I don't understand how the scan jamming thing would work on you ship (Where would you put it?), so I doubt that it is a real item, but there should be plenty of ships, and other thing to keep you busy - I don't think you'll miss the other items from Privateer