Among the Elite Speed Johnny Lightning cars, there are more Corvette and Camaro's than other makes.  

Elite Speed
Top Tier

1969 Chevy Camaro
2004, Street Freaks, Black with Flames
61 grams, Casting #537
Perhaps the most famous racer among the Johnny Lightning cars.  This is my fastest non-truck or van JL.  An elite speed car that's heavy with great balance.  Note that it took me three purchases before I found this one.  JL's can be inconsistent.  This is also a high demand car that's not cheap.

2003 Chevy Corvette Convertible
2004, Modern CLUE series
48 grams, Casting #735
This small little car packs a powerful punch.  Another fast car from the CLUE series.  This car features Racer's Edge Speed Wheels.

1995 Chevy Corvette ZR-1
1996, Classic Corvettes
49 grams, Casting #170
Small frame, but with a reasonably wide frame, decent weight and features Racer's Edge Speed Wheels.

1965 Chevy Corvette
1999, Corvette Collection series
48 grams, Casting #733
Compact frame like most of the Corvette castings, yet finds a way to generate speed.  This car features Racer's Edge Speed Wheels.

1968 Chevy Camaro
2004, Spider-Man, Toys 'R Us exclusive
52 grams, Casting #536
The '69 Chevy Camaro may be king, but this '68 model is just close behind.  Both the '69  and '68 were issued in 2004, the pinnacle of Johnny Lightning releases.  Just noticed that my top 4 JL's are all from 2004.

Chevy Corvette Nomad
1996, Classic Corvettes
37 grams, Casting #171
One of my fastest lighter cars.  This car features Racer's Edge Speed Wheels.

1998 Chevy Camaro Z28
2004, Modern CLUE series
41 grams, Casting #847
Yet another fast CLUE series car.  Relatively light for a Johnny Lightning car.

1969 Chevy Camaro Convertible
2004, Street Freaks, American Glory
46 grams, Casting #265
A similar casting to the '69 Camaro, this convertible is lighter, but still runs very fast.

High Speed
2nd Tier

Most of the Corvette castings are relatively small, but still fast given decent weight and good wheels.  

Car	Year, Series	Casting Number
1963 Corvette Grand Sport	2001, Corvette Series	736
1999 Corvette	2003, Corvette 50th Anniversary	392
Corvette Sting Ray III	1996, Classic Corvette Box Set	175
1954 Corvette	2004, Vintage CLUE Series	731
1978 Corvette	1996, Indy Pace Cars	466
Custom Camaro	2003, Cat in the Hat Series	119
1970 Camaro RS/Z28	2002, Camaro 35th Anniversary	538
1965 Chevy Corvette Mako Shark	1996, Classic Corvette Box Set	172
1982 Corvette	1996, Classic Corvette Box Set	169
1957 Corvette	1996, Classic Corvette Box Set	166
1967 Corvette 427 Convertible	2001, Kay Bee 5 Pack	168

Good Speed
3rd Tier

Some of the next fastest cars include Bad News (aka 1960 Chevy Station Wagon)  from the Thunder Wagons series, the 1954 Chevy Corvair from the Marvel series and the 1997 Chevy Camaro from the American Blue Release.  There are several other fast cars as well including two more from the 1996 Classic Corvette Box Set: 1980 Chevy Aerovette and the 1962 Corvette Roadster.  The 1969 Camaro Convertible from the Indy Pace car series is another fast one.