I'm interested in a wide range of tickets. It just depends on whether I'm interested in one of the cars that come from that particular ticket or not. Since I didn't think to save a copy of any of the tickets I won from the game when I played the first time I've since gone back and have done most of the game all over again from a second account and didn't use a single ticket. So I have just about every level ticket along with most of the green prize car tickets. I think I have something like 110 tickets in the alt account. So when ever I want something all I have to do is shoot a copy of the appropriate ticket from my alt account over to my main account. So I don't need to trade for level tickets but I do anyhow. This way I can help someone else get something they need while getting something I could make use of in the process. So it's a win-win for 2 people instead of just a win for myself.
As for the seasonal with the level 22 ticket I used the Toyota 7 and won all the races with ease. The most important part with tuning (at least to me anyhow) is to make sure it's geared to the track. If you have mostly high speed corners and a lot of long straights then gear it for top speed. But if the track has a lot of sharp turns and short straights I will drop the top speed down 30 to 40 mph so the car will accelerate faster out of the corners.
I think I have the Toyota 7 set to be shared with friends right now if you want to borrow it and see if you have any luck. I'm about to do the seasonal all over again in my alt account so I can get a level 22 ticket on that account.