Lots of good advice here. As highlighted by many, go where the schools on your son's vetted (both academically and athletically) will be. These vetted schools are a "possible" fit and your son is marketing himself to them.
And as Smoke said, going in the November prior to son's Junior season is ideal for getting on coaches' radar.
When showcase / tourney conflicts arose, my sons contacted the coaches to ask who will be there for each school on his list. HC and RC are the key. We stumbled early on with my 2012 and went where there was a lot of volunteer assistants. Many of these coaches are great guys, but generally have a lot less clout/input in the recruiting process than the HC and RC.
Lastly, I love HF. One of my sons worked for them this Summer. Great organization. And HF was highly influential in both my boys' recruiting efforts.