Is your OEM trigger a standard Rem 700 or the newer X-Mark trigger? If the former, then you already have the parts you need to install the Shilen - just need to swap them over, which is a pretty simple task. If you have the X-Mark, then you need to purchase a couple of extra parts, as follows:
* Safety -- http://www.midwayusa.com/product/479...vc=sugv1523226
* Bolt Stop Release -- http://www.midwayusa.com/product/352...700-steel-blue
BTW - Midway has the Shilen for a bit less than the $110 you mentioned upthread. The Midway price is $98 -- http://www.midwayusa.com/product/523...54BrandPopProd
I have not compared the Shilen to the Timney, but I have installed the Shilen trigger in two rifles and am quite pleased with them and the improvement over the Remington OEM triggers.
I hope this helps.