best way to reconfigure ASA 5505 for new Static IP that has VPN's configured

No easy way to do this....   It's going to be a hard cutover.   Will you have modem access to the firewall console or some other secondary connection?   Will there be a competent person on the far end?   If not, then you need to build the code and quadruple check it before deploying to the remote ASAs.    

Remote's 1st, update the peer address.  Don't write mem.  
Then local, update peer addresses.  

Then the long wait until the tunnels rebuild.  

If everything comes up, write mem.   If not, then a asa reboot gets you back to the original config for another attempt.  

I've done a few IP changes with no secondary access and its the longest 90 seconds you can experience until the devices come back up....  

All sites\buildings have system that i can logmein to (remotely access ASA console) if that helps.

Sure does take the pressure off.   If something is messed up in the ASA config, you aren't cut off from the console or the ssh....  

If posting ASA Configs would help i would be willing to.  Let me know if that helps.