I’ve heard some insane car setups (and own one lol). How loud do you need to actually get? These pa speakers sacrifice quality for quantity, so if you really don’t need to get that loud, there are other options. I would just say to get the best you can now, and get a sub later if you feel the need for one. For example the Mackie Thump15A is rated down to 32hz and will probably satisfy your bass needs (also fun fact it’s 40 pounds per speaker). So I would then look at getting two of these and see if you still want a sub.
Here is a refub pair for $550, which is at the high end of your budget, but will probably not need a sub.