Well first off welcome!
I think you'll get the response of ask your instuctors alot on here, because they know you better than the interweb does when it comes to canopy flight. I'm a newb but recently bought me a rig, so i'll share what little i know on the subject. When it comes to canopies stay away from ellipticals, stay at a 1:1 wingloading for 200 jumps, at 170 pounds your exit weight is close to 195, so a 210 might be a good first size(again talk to your instructors)
I bought a PD reserve because i did not here one bad thing about them.
i got my container sized for a 150 main so i could get the most life out of it(curently jumping a 170) because containers will normaly accept 3 sizes of mains; soft, optimal, and "brick". But not all canopies have the same pack volume, i.e. a PD Storm 170 packs the same size as a PD Sabre2 150. Everyone is partial certain brands, but i'm sure all manufactures make good products. just do some research, and pick out the one you like, I personaly would start with; http://www.unitedparachutetechnologies.com
p.s. don't forget to check out the classifieds on here.