Blu-raystats.com is accepted as an accurate source of all titles currently released. Your totals seem to include titles that have not yet been released.
Blu-raystats.com shows 433 Blu-ray titles available domestically today. I eliminated the 30 Paramount and 3 Dreamworks titles as they have dropped Blu-ray support. I know you may still find some of these titles in the retail channel, but they are not making anymore of them and there is no guarantee of availability. If we include them into the combined domestic/international number we get.
Total HD DVD = 449
Total Blu-ray = 446