I dontknow how limited your budget is but Topps Chrome is a nice product. You can get a box for around $80 and each hobby box comes with an Autograph. The refractors are nice also.
I would agree 100% with Chrome, best bang for your buck usually. Occasionally get a real nice hit, but usually always get your money's worth. Chrome cards hold a nice value and again stays fairly stable.
i always say buy singles if you want to build your collection.... you can purchase most of the best hits for the price of a box these days... but nothing beats pack busting and getting a good hit.