Here's my top 10 if it still makes any difference:
1. FCR900 - Bike
2. BF400 - Bike
3. Freeway - Bike
4. Infernus - Car
5. Washington - Car
6. Huntley - Jeep
7. Burrito - Van
8. Maverick - Helicopter
9. One of the planes, with at least 2 possible seats
10. Squallo - Boat
As it can be seen I added 3 bikes to the list, simply because I really think that we lack bikes in-game. We got quite a bit of different type cars but only 3 different bikes, which one of them is a police bike and is included in the "must have" list.