If it were me, I'd be looking most heavily at getting set up for 305 racing, because I would hope to make the jump to 410 non-wing at some point; and it'll be less cost overall if you just have to replace the motor, take off the wings and purchase a few components than buying a full mini-sprint outfit and having to sell out to jump up in class.

And with a 305, if you feel you are good enough and you can afford to, you can take off the wings at a place like Bloomington and run with the 410s for laps. You may not be head of class in a 305 but on a slicked up track you should get to race enough to make laps worth something.