Naive Classique is my go-to label for Vivaldi. Outstanding sound and HIP performances from the best Italian, French, and Spanish groups. Any Vivaldi recording from Alessandrini/Concerto Italiano, Biondi/Europa Galante, and Savall/Concert de Nations is leap and bounds beyond anything released in the anglo-saxon world. There is something in Vivaldi lightness that just requires that Latin touch.
Naive is running a Vivaldi Edition, based on 450 Vivaldi scores that were practically buried in the National Library in Turin, Italy. This project is changing the perception of Vivaldi from a composer of entertaining concerti, to one of the masters of Baroque vocal music.
Their CDs used to be expensive but recently they have started releasing some bargain box sets: for example this
Vivaldi Sacred Music box set contains one of my desert island recordings
if you want to check Vivaldi's Operas you should probably consider this highlights
boxset, which unfortunately does not include my
favourite Vivaldi opera recording:

(as you can see there is a pattern in the Vivaldi Edition covers...)
If instead you are looking for Vivaldi Concertos I doubt you can find a better bargain than this
Europa Galante boxset.
Finally I should mention that you can find all of the above (and then some) on spotify...