Should I opt for new sears?

I don't have a humongous budget to spend upgrading a BAR-10, so obviously I can't get the ultimate uber zero trigger. So the upgrades I'm getting is this :
http://www.evike.com/product_info.php?cPath=648_655&products_id=32804

This includes a metal piston, and spring guide which is quite good. However, the only problem is that it comes with a M170 spring. I'm thinking that it probably is going to wear out the sears, but I may be wrong.

If I do need new sears, would I be able just to get this trigger assembly? :
http://www.evike.com/product_info.php?products_id=34005
(Matix Trigger Assembly)

or should I just get reinforced sears and add them to the stock trigger box? :
http://www.evike.com/product_info.php?cPath=648_655&products_id=35657
(Angel reinforced sear set)

If you think I should go for any other items then let me know! I am new to modding and I hope I learn a lot from here. Also, I probably will get a tightbore soon so no need to mention that