Fault Tolerant BizTalk Clustering

Hi,

  I am looking for some best practices for installing BizTalk cluster in a

fault tolerant environment. 

 Heres the servers

 SQL1 and SQL2 are clustered VSQL(Active -Passive)

  we need to cluster BizTalk servers  BTS1 and BTS2 using  a separate 
cluster group VBTS ) MSDTC 

 Can you please let me know whether Master Secter Server and Enterprise 
Single signon needs to be clustered in the same bizTalk cluster(VBTS)?

IO have already looked at the Microsoft Technet Do***entation

http://www.microsoft.com/technet/prodtechnol/biztalk/2006/library/bts06clustering/4daea7c6-7d26-440c-a2a0-fa018a25b2b3.mspx?mfr=true


 Any suggestion or best practices 


-Regards,