Personally I think it depends how you intend to cook.
I am a flipper- pusher stirrer in my saute pans so I want tri-ply on all sides.
Sauces And stockpots - same thing for me- Think of it like this, if you are buying "disc bottom" pots you are really only heating the base of your "stock" The tri- ply is more efficient - imho.
Now for boiling water, steaming veggies ect I would buy a cheapo stainless steel Pasta pot.- it's efficient at Boiling water!
Online people have raved about the
Sams Club Titanium Tri Ply brand (Much much cheaper than AllClad) but I personally have not cooked with it. Plus I don't know if you could even get that kind where you are?
How much cooking are you planning on doing? For one? For parties??
If it's for anything other than just you- a set might be the way for you to go.I have had Calphalon for about 20 years now and I am going to upgrade myself so I have been looking.
But really all you need right away would be a 10 inch saute pan, a stock pot, a cheap stainless pasta pot, and a non-stick skillet of some kind. Those pieces will hold you over until you decide what you like. (A non-stick grill pan might be nice too)
And to answer your questions briefly
1. To me, Yes there is a benefit. EVEN Temperature cooking. So No not a waste of money.
And on the web this guy has more information you would ever need on tri-ply vs. not. but it is down for Labor Day maintenance- will be back up sometime this weekend.
http://forums.egullet.org/index.php?showtopic=25717