@fohdeesha probably gets at least 50 messages/day and I'm sure he'll appreciate all inquirers give him leeway to respond as he finds the time. This thread is pretty unwieldy but packed with a lot of great information; make good use of the Search function w/ This Thread option selected.
The 6610 is quite loud and you can't really replace the fans to quiet them down, especially if you have Rev.A or I[ntake] fans/PSUs which have orange filled arrows. Get one with Rev.B/C and E[xhaust] fans which have green filled arrows. Search for RPS16-E and RPS16-I for comparison on eBay. Others have installed additional fans by modifying the lid/insides.