How to prevent WHOIS to display the details of registrants?
Any workarounds?

Some domain registrars provide a service to hide your personal details used in the domain registration..

Google for whois protection

godaddy have the option make your details private... but at additional charge...

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Any comments for RegisterFly and NameCheap?

RegisterFly - free for life.
http://registerfly.com/protectfly/

NameCheap - free for one year
www.namecheap.com

http://www.namepros.com/industry-new...-for-life.html
http://www.webhostingtalk.com/showthread.php?t=613888

for me , registerfly is a nightmare.

to protect whois, you can subscribe whois protection/privacy or ID shield from registrar.

some of my client they register like below to protect their detail

Registrant:
NA NONE@NONE.COM +60.123456789
NA
NA
NA,NA,MY 0

Administrator:
NA NONE@NONE.COM +60.123456789
NA
NA
NA,NA,MY 0

Technical Contactor:
John Smith NONE@NONE.COM +60.123456789
NONE
NONE
NONE,NONE,MY 12345