My 12 y/o son is so excited. Found him a pristine Mid-2010 27" iMac for $100. Going to give it the SSD upgrade but he's stoked to start recording music with it :
SSD Kit for all Apple 27” iMac 2010 Models + tools - 17.65EUR - OWCshop
How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
OWC DIY Drive Upgrade/Install Kits for Apple iMac Models
Other World Computing Internal SSD DIY Kit for Apple 27" iMac 2010 Models, Other World Computing iMac to SSD SATA 3Gb/s Sata Cable - iMac to SSD/HDD.., By OWC - Walmart.com
How to Upgrade iMac Hard Drive (2009, 2010, 2011): EveryMac.com