Pulling from my 80's roots. I'd have all the special edition G-body cars..
First off, the oddest body style of all the G-body's, but with the Turbo, non-intercooled carb'd 231. I like it for the sheer freak factor. Would be way cooler with an intercooled and EFI 231 from a '87 GN.
The '79 Hurst/Olds, just for the beginning of bringing back the H/O line.
You can't say H/O without the 1983 15th anniversary edition. Can you say "lightning rod shifter"?
If you have an '83, you have to get a '84 H/O with the reverse paint scheme. Also with t-tops and lightning rod shifter.
The 85-87 carried on the 442 line, the later getting the cooler looking "eurosport" composite headlights. I'd have one of each year.
From the Pontiac Stable the 2+2. Don't call it an Aerocoupe. From the days when there was still some actual split in the GM divisions, the Pontiac crew was trying to find an edge in NASCAR the same time the Chevy boys were putting the big goofy window in the Monte SS. They do not share the back glass. They are very different if you look at them close. Decklids differ too. Funny side note, the trunk was just as huge as they all were, but with a mail-slot for an opening they had a rough time accepting hard sided luggage or anything significant in size.
Dat ass tho.
Stepping into the Chevy camp, into the oddity again, an early Monte Carlo with the Buick blow through carb'd, turbo 231. Yep they did it. Other than that hood with the offset bump in it, the only other cue it had a turbski was the little badge on the center a/c vent that was just a bowtie and the word "TURBO". I have one of those a/c outlets with the badge stuff in our garage somewhere.
Obviously one can't have a complete collection without a Monte Carlo SS with what I feel are the coolest wheels on any G-body. The N90 wheel is my favorite. Pretty sure it's my Dad's too as we have three sets stashed away. Similar in style to the wheel used on the Z28 in 80/81, the Monte wheel is an 8" wide unit vs the Camaro's 7" wide version.
Of course the Aerocoupe is on the list. It's a love or hate style. I love it. Memories of Dale Sr in that Black Goodwrench Chevy storming the superspeedways are burned into my brain. It was Chevy's answer to the swoopy new Thunderbird and it worked.
The El Camino is part of the list as well. The '78/79 versions could be had with a Saginaw 4-speed. Lower chin spoiler is unique to the El Camino only.
Not to let the Bandit T/A have all the fun, the Royal Night El Camino was complete with it's own incredibly bad hood decal too. I love it.
One can't forget about the El Camino SS with the Monte SS nose from Choo Choo Customs. What a blend.
GMC got a little play with the Caballero version of the Elky. They also wanted to party in the 70's with their own Banditized version called the Diablo. As in, "Give me a diablo sandwich, a Dr. Pepper, and make it quick, I'm in a god-damn hurry." That quote is from Smokey and the Bandit, you think the the GMC guys might have put the subtle nod in there.
Coming back around to the Buick side of things, you must have a Buick Grand National on the list. While all the other G-body special versions looked cool, the GN had the performance to back it up. The little 231 v6 came into its own with the addition of EFI and later an intercooler to bump the power more. Just sinister.
The T-Type Regal carried the same turbo 6, but was available with colors besides black. Interiors differed from the GN brother, but still kicked ass.
The "Turbo-T" was an '87 only extension of the T-Type by dropping the "type". The "T" could be had with or without the Turbo engine oddly enough.
The grand poobah of all G-body-land is of course the GNX. Putting shame to the Corvette in 1987 as the fastest GM production car that year, the GNX is a bad SOB. More turbo, bigger intercooler, revised 200r4 trans and completely redesigned 3 link torque arm rear suspension, fender vents and wider wheel flares the GNX was full of awesome. Actual Stewert Warner Gauges, numbered plaque on the dash and it came complete with a Jacket with the car's number sewn into it.
I'd need one hell of a warehouse to store all that 80's coolness.