power for mc452 and c2600

I'm relatively new to high end audio. Had a mcintosh integrated amp for few years and now decided to upgrade to separates. Just received c2600 preamp and awaiting on mc452 amp due to arrive sometime next week. 

I don't know anything about power conditioners and protection devices. currently using monster surge protector. My questions: 

1. what is the minimum protection device that one would use for my equipment
2. does it have to be a power conditioner or just surge protection
3. how much do these "power conditioners" contribute to the overall performance? Can you objectively measure their effect? Can they worsen the performance in any way by limiting power? 
4. is there a real difference in relatively affordable (200-500) vs. higher price units (1000 and above) ? 
5. What are you using and what is your experience with it? 
6. Your recommendation on units with good reputation under $500

thank you