tire size help

[CVstarBoxster]

I'm currently running 19s on my car with General Exclaim tires. my front tire recently blew up so I need a replacement. the tire numbers are: 235/30/19. I was gonna get a new set of wheels... go back to 18s since 19s are too heavy, but I don't have that kind of money right now. So, i need a new tire; however, I cant seem to find general exclaim tires with those configurations. I did find General G-max with the same configurations (but these are all season tires - no summer, which is what Exclaim is). My question is whether i should get the G-max tire? Or, is there a similiar configuration (to 235/30/19) that I can buy in the Exclaim model, which wouldnt make the car ride in a messed up way.