seems to me like u want to buy tires for performance purpose but u may also need tires period right now.. My suggestion is throw u'r stocks on & run to the local firestone shop for their $99.00 special for the winter usage.. & over the winter grab up some cash & stick some nice tires on u'r rota's so that they are ready to bolt up for the summer!
why tear up the rota's in the winter!