What a/c system to buy

[55cruiser]

Hi: Not sure if this has been kicked around before, i have 55.2 sb,ss and want to install heat & a/c. I have had vintage air in another project and had no issues with that unit.

When i start looking for a/c now i see southern air for $850.00 old air for $1,250.00 and vintage air for $1,450.00. That is quite a price spread when the units all do the same thing, right !

Any comments pro or con an any of these units, would be appreciated. Just trying to get the best bang for my buck.

Thanks