Hiiii :) Which car should i purchase...Acura TSX,2010 or a Dodge Challenger SE 2009?

Those are pretty good options at 17, you're lucky. The Acura will be more refined while the Challenger is a little more raw, depends how you like to drive. I would easily choose the Acura for myself just because I like their products and reputation, plus I've had terrible luck with big 3 products in the past, but that's me. Go drive them both and compare everything for yourself to see what suits you better.