[Choplifter Extravaganza!]

There are at least three (possibly four) different Atari 8-bit versions of this game.  In addition to the various Broderbund releases on disk and cartridge (and perhaps tape), Atari published an updated XE cartridge release that was developed by Sculptured Software...

http://www.atarimania.com/game-atari-400-800-xl-xe-choplifter_17338.html

[Threshold (Tigervision)]

None of the versions of Threshold were really all that great.  Neither Astro Blaster nor Astro Fighter were ever ported to home consoles back in the day, but Bob DeCrescenzo did excellent homebrew versions for the 7800 a few years back.

https://atariage.com/store/index.php?l=product_detail&p=1043

https://atariage.com/store/index.php?l=product_detail&p=1057

[Threshold (Tigervision)]

Both Sierra's Threshold (which was originally an Apple II game) and Activision's MegaMania were clones of Sega/Gremlin's Astro Blaster, not Galaxian.  Astro Blaster itself had been an attempt to replicate and improve upon Astro Fighter by Data East.

The VCS port of Threshold was done by the original programmer of the Apple II version but significantly simplified.  The original featured a temperature gauge in addition to a timer/fuel gauge, and firing too many shots in too short of a time period would overheat your laser and prevent firing of additional shots until your laser cooled off.  Without this element, pretty much all you're left with is the exact same game as MegaMania...except not as good.

[Lost Luggage (Apollo)]

Actually, despite the 1981 copyright, Lost Luggage was released in mid-1982 (right around the same time as Racquetball and Space Cavern) so Kaboom! predates it by several months.  I actually like the musical jingle at the beginning but perhaps I'm being overly nostalgic.  How many games even featured music (or any attempt at it) at that point?  Speaking of which, I assume you've heard this?

https://www.youtube.com/watch?v=kcC_am2I8W8