Hello Matteus. One thing to keep in mind about Dive Boat trips after Christmas:
January is the month that traditionally sees most, it not all, dive boats "haul out" for nearly an entire month of Boat Maintenance. It is very possible that there will not be any dive boats making any trips to Catalina Island for the entire month of January.
The Casino Point may be your only chance at diving. Although I don't know about Scuba Luv because I only take boats from the mainland.
Take a look at this So Cal Dive Boat Database and type in some dates and destinations, you don't need to fill in all the info, just the dates and destinations to get the most hits.
California Diving News - Dive Trips - Directory
I really didn't see anything listed for January.
My further checking of the online sites for most so cal dive shops and dive charter boats have also revealed very little activity in Jan 2011. I saw a few trips in Late Jan and few in late december.
However the casino point is a great, great dive that will not disappoint.
I saw your comment on most rooms being $100. If you are traveling solo, check out the rates of Hotel Hermosa.
https://www.hermosahotel.com/reservations.html
Get a room with a kitchen and save big on the cost of eating on the Island, or just get the super economy room.