it actually depends very much on whether your call+sms is a lot.  DiGi Smartplan is more suitable for those user who uses less call+sms.  My DiGi bill only RM80+ including the RM68 Smartplan.  So it is a no brainer for me to sign up DiGi.  Moreover, can get H-speed at both my home and office, so good enough for me. 

But for users with lots of call+sms, it may not be the best.

s3 with 4.7 inch screen is so big already, and now you want to carry 2 phones as you will have another maxis phone to carry...wah??

yes, if it is your second phone for receive call and surf, then i think no one can match its price.  Of course, network coverage is the other factor you need to consider.

but, just curious, since you are getting a second phone for surf, why no get the Note instead?  It is much much much better for browsing or can even consider the Tab 7.7.