LG VX-4700 / VX-4650 / AX-4750 / UX-4750

I have read numerous posts here and elsewhere but am still confused. I have a LG 4650 verizon phone and want to synch contacts/calendar and upload ringtones to my phone. I am still debating on buying a kit from Wireless on Ebay (http://snipurl.com/iw3h) but am unsure now based on what others have said- http://snipurl.com/iw3j .

I heard buying a Verizon Mobile Office Kit (http://snipurl.com/iw3q) for the 6100 or 7000 may work. Any know about this? thank you