We are always left wondering when someone comes on young, like yourself, wanting a sportbike & saying "--been riding dirt bikes for awhile --".
That could be occasionally in have a few short bits of fun with a frieinds bike or possibly an intensive rider in dirt thought not in competition.
You have the advantage of knowing how to use the clutch, gear change lever, along with balance. Brakes will not jive for as a competitive dirt bike rider for 42 yrs I knew all the time I was heavy on the rear brake. FORTUNATELY for me I was riding street/hwy at the same time.
So I would say line up a time you can take the MSF course, for while some will be familiar, some will NOT.
Also for your first bike I would aim at a 500cc vertical twin & you will find they are offered by both Suzy & Kwacker.
With one of the above you should get along well so that come next season you can go for your first sportbike & if you keep the 500 in good shape it will sell to other beginners at a decent price.
Remember either bike has a good regular riding position, good mid-range power-plant so not to peaky, decent brakes & suspension system. Then have enough go in them to be faster when the light turns green then most cages & can scoot you up to 100mph.