Best Effects for Vocals

I have been working on several songs in HS. I have a couple of great singers but I don't really know what I'm doing when it comes to adding a bit of reverb and/or delay on the lead vocals. All of the HS presets for reverb and delay seem to sound really cheezy when I apply them.

I know this is really subjective but, in general, what are the most professional sounding effects that I can use on vocal tracks? Also, what kind of EQ settings work best on vocals.