San Jose Unified School District school finder: http://www.schvision.com/schoolfinder2/SJUSD/
San Jose Unified School District Office: http://www.sjusd.org/
You're right, many buyers are eager to pay a little more to get their children into preferred schools. The boundaries in Almaden have not varied in recent years and I know of no plans to change in the future. Certainly, the boundaries are set for the 2010-2011 school year as the registration period is now open. You can check at the SJUSD enrollment center on Pearl, near Branham, or call the district office at 408-535-6231.
Regardless of boundaries, be aware that classes fill up before the semester starts. Even if you are in the right neighborhood, if you wait to long to register you may end up with an alternate school assignment and be put on a waiting list for the local school.
If you need help finding the right home with the right schools in Almaden Valley, feel free to contact me.