Looking to get my first speed light, which for now will strictly be used on camera. Should I go for a TTL model or would manual be stuffy sufficient? It would get its most use at family birthday parties, pictures of my kids, etc. Currently have an 18-55 3.5-5.6 lens. TTL would probably be less hassle on the fly, right? Or would manual be sufficient? Eventually I want to get into off camera flash, just not at this time. Am considering one of Yongnuo flashes. Thoughts?