The 2nd gear issue can be fixed by using a quality transmission fluid. The problem goes away once oil is up to operating temperature. DC5s are extremely easy to modify. I've seen to pretty much all the issues a DC5 has on the track. If you're going to track the car I recommend a good oil cooler (Trust) and torque damper or engine mount upgrades (Spoon, J's Racing).
The Recaro seats always get worn. They can actually be rotated. My passenger seat is in perfect condition and the drivers side is worn. Just swap them and move the recline wheels.