first what do you mean system controlled? do you mean a fan control unit or actually changing the speed of the fan from windows (or other OS)?
if its the former what model, if the latter i dont think its possible, you could go the cheap way and put a viriable resistor on the cable to change its speed...though i dont really know if this actually works
2nd, for your case the "Dials on it telling me tempatures fanspeed" dont often come with the case, unless its quite a high priced one. just get a fan controller and put it in one of the 5.25" drives. also does your 120 include a PSU? if not then do you need a PSU as well?
i like the P180, looks kinda like a fridge but comes in either black or silver. has good airflow because it is all compartmentalized and is very quiet costs 124.99 on newegg.com
although some ppl say that its pretty big from what i've gathered