I'm at the point where Godfests don't really excite me any more. I have pretty much all the best monsters for the right teams (helps that most of them come from descendeds!). I get more excited about gameplay updates (Awakening).
Godfests still entice me, but I am not pulling with the frequency I once did. Unless it's a crazy good pairing like the last one (Chinese/JP2.0), I roll but a few if there are subs that can aid my current teams.
I only have a couple so I'll be rolling a few times on this one.
Spend stones as you please, but the Players' Choice Godfest that chrono01 mentioned will probably be where you'd want to plunge the majority of your stones especially if you have only a couple of gods. I believe you also mentioned IAP'ing on one of your accounts so maybe this is all a moot point. Anyways, just keep in mind the Player's Choice one that will be coming shortly.
Having a Shiva that I still use (and a Lakshmi that is stuck at lv6), news of their upcoming bustification is very welcome. I am unsure how to improve Third Eye or a heartmaking skill, but Magic-Draining Light is in dire need of improvement. Maybe Gung Ho will give their actives added effects similar to the recently announced news.
Ugh, past midnight and I gotta sleep. Heading to Capcom Cup tomorrow! Hopefully as fun as 25th Anniversary was last year.