There are a handful of early season mangoes that are, however, not something worth running out to plant other than to say you have an extremely early season mango. If your acreage was unlimited I might recommend them but I am not even sure of that. Im my opinion, stick to quality and you can always purchase a few of the early "odd" varieties if you must have a taste of mangoes in March or April. I would prefer to build up the waitig and enjoy the better quality fruit in a more narrow time period. It make them that much more enjoyable. It is like people who buy mangoes in grocery stores over the "off season". You knopw what you are going to get, crap! Why waste time and money on them. Again, you will enjoy the fresh picked quality fruit that much more by passing on fruit that is not only far inferior but basically unripe and inedible.
If space is an issue, be wary of planting some of the larger/vigorous growing varieties (Valencia Pride, Baileys Marvey, Haden (not only is the average Haden just that, average, it is also a little fibrous and susceptible to anthracnose which makes it not really worth it...I would much rather have to spray a Dot to get fruit than spray a Haden to get fruit as Dot are far superior in avery aspect). They can get quite large, taking up space that may make you having room for 7 down to room for 5 or 6. I am also not a fan of either Valencia Pride nor Baileys Marvel but thats me and tastes are subjective. There are many who love them and many who don't.