Pac-12, Big 10, ACC, SEC...with the WCC following up.
Just based upon last season, the spring and the incoming players here is my top 5:
1. ACC: With Florida St., North Carolina and Duke all being bonafide contenders (It is likely that 1-3 of those teams will make it to the college cup) makes this conference tough to contend with. Add in a darkhorse Notre Dame side and sprinkle in Virginia and you have a very top heavy league. NC State should be good again but we will see if last year was a fluke. The bottom half of the conference is horrible but with 6 legitimate top 25 teams they are the preaseason top conference.
Pac 12: Stanford and UCLA are two of my 6 legitimate college cup contenders. Add in talented Cal and $C teams. Utah could be a top 10 team and Colorado looks to follow up their amazing turnaround last year with another solid year. That gives them 6 teams that will be in the preseason top 25 which puts them right there with the ACC. If Cal is can live up to their hype and/or $C can find suitable replacements for their graduated players then they could easily end up in the top 10.
Big Ten: Penn St. will be the favorite to win it all. Rutgers, Northwestern, Michigan and Ohio St. will be good. Wisconsin, Indiana and Nebraska could all surprise. Penn St. Wisely scheduled a tough preseason schedule so that they are ready for the other 5 title contenders come late in the season.
SEC: Florida is a top 10-12 team and Texas A&M, Auburn and Arkansas will be very good too. Add in Missouri and Tennessee and you have a decently strong conference. The bottom teams are pretty bad but the quality at the top makes up for it.
WCC: The last spot was tough but I have to give the WCC the edge over the Big 12. Santa Clara, BYU and Pepperdine are legit top 25 teams. LMU will be good and USD should be decent too. Even Portland and USF will be okay. The top teams separate them from the rest. The Big 12 has WVU at the top and everyone else is an also ran. In the WCC there won't be one team that steamrolls everyone.