Welcome to DC.
I think you have the values wrong. The Twin Signature line is a higher grade knife than the International Forged Synergy.
If you look at the logos on the knife blades, you will see the Twin has a two stick figure logo while the Int'l Forged has a single stick figure logo. This is how Henckels identifies its better and budget lines.
That being said, I would recommend you don't buy the set but look for 3-4 knives good quality knives will handle all your needs.
I'd go with an 8" Chef's knife, an 8" to 10" serrated bread knife and a 4" paring knife. Beyond that, a boning knife might be a good idea if you plan on doing a lot of boning. A santoku style knife may be good if you want a lighter knife to do a lot of veggies.
"If you want to make an apple pie from scratch, you must first create the universe." -Carl Sagan