Comparing the Azenis and Yokos is an apple and oranges kind of affair. The tires you're looking to replace are a DOT R-comp, whereas the RT-615 is a sticky street tire. If you're competing in STS or something, the RT-615 is a decent choice.
To stay in the same class of tire, you should be looking for R-comps, as those are more likely to give you a similar level of performance. The Toyo RA-1 is one example and Edge Racing is selling those for about $170/ea.
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