League of legends have upto two months in advanced who they have on sale.
I've seen an ADC Thresh a couple times and they are surprisingly very good but quote difficult to play, however Thresh is a support which should get no kills at all unless the ADC has left Lane.
If you play tristana, I'd advise going AP simply because I've never been able to beat it before (thats because of the champs I prefer)
The problem I have with kayle and ashe is that there to slow to begin with and for whatever reason that is really quite annoying.
However kayle used in the LCS this week was absolutely beast, if your maxed build anyway, shreds people and turrets.
I play 5v5 more so these may be a bit different.