AMD Athlon X2 4850e
Gigabyte GA-MA78G-DS3H rev.1.0
Kingston 2x1GB DDR2 800MHz CL5
Samsung Spinpoint M5 HM160HI - System drive
Western Digital WD6400AAKS - Storage drive
Pioneer DVR-216BK
Antec Solo
Corsair VX450
I know the AMD 4850e is a cooler running processor but I want to be on the safe side. My old Duron 1300 idles at 50-60 C even in cooler months and 65-70 in summer. There's not much I can do except to reconfig that old computer, but the economics is not worthwhile. Hopefully, with the newer components, I can have a more cooler and stable system this time around and finally retire the old system.
Most of SPCR's Recommended CPU heatsinks are available from online vendors who can ship nationwide. No problem there. I have shortlisted my options to two: Thermalright HR-01 Plus and Xigmatek HDT-S1283. Scythe Ninja seems too heavy and problematic for me, Ninja Mini is $20 more than HR-01 Plus, Noctua along with its other quirks is much too expensive (who spends more for a heatsink than they do for a processor? I'm sure some do

I have never had to deal with these modern, heavy, tower heatsinks before. I always regard the heatsink, fans and cooling the most complicated and frustrating part of a build. At least for myself. For SPCR veterans, it's probably a cinch. So bear with me here.
I would ideally like to run passive (still an option in winter, cooler months), but, as you might tell from my situation, it's better to have some airflow on the heatsink.
I value silence (extreme quietness?) above all but I want a functioning computer, not a crashing one. What do I have to be aware of when installing the heavy tower heatsinks? Do I need an aftermarket AM2 bolt through kit and mounting frame or will the stock motherboard ones do? I'm aware that these heatsinks will not allow you to rotate the fan orientation on AM2. Will this have a negative affect on my setup? An S-clip is available for the HR-01 Plus, but it is difficult to source. This can all get quite confusing

P.S. I will not ask for specific fan advice as this is the CPU Cooling discussion. Yet they are so closely related. I have read this article also. Many thanks.