lets tackle this one question at a time, rear shocks i would recommend ONLY delcos, because you get new mounts and also, a correct right and left side (air line fitting placement is different) you can get them for $202/pair shipped from www.gmpartsdirect.com
The front struts i would also recommend getting new mounts/bearings, especially with that many miles.. these parts tend to wear out over time. I have heard very mixed reviews about monroe shocks and struts, and based on peoples feedback, if that was my only 2 options io would stick to the delcos, unless there is a BIG price difference.
I would check out www.intense-racing.com
for new Hub bearings aswell