There's no point in only being able to swim well (and fast) when you are wearing a wetsuit. Wetsuit manufacturers add buoyancy panels in the hips to a lot of their suits to compensate for poor body balance and position in the water. But wouldn't it be better if you could find this balance without having to wear a wetsuit or use a pull-buoy in the pool?
TI coaches recommend you choose a neutral buoyancy wetsuit.
Any wetsuit that gives you more buoyancy in the hips will damage your natural balance in the water.
The ultimate swimmer's wetsuit in my opinion is the Zone 3 Align. It perfectly compliments the balance you learn with Total Immersion technique. It is also my personal choice of wetsuit.
I am a certified level 3.0 Total Immersion Swim Coach.