the early intel iMac's dont have bad capacitors , but a far away from trouble free ...
graphics card's , displays, logicboards ,powersupplys are only some of the problem zones , if you want to know more , just search the forum and you wont get disappointed on the search for problems , or just look ebay and you will find the most common are stripes on the display happening at around the age of 3
so if you want a white intel iMac , get one where the problems already happened and got repaired under apple care like i did , because i too love the 17" , anything else is a still expensive gamble ... and try to get one of a certified apple repair technician or from a "shop" that knows Mac's , careful at ebay , lots of people out there who want to get rid of "their" iMac in favor of a new working one , ok there are honest ebayer's out there somewhere sometimes , but just keep in mind its your money , you know how hard you worked for it

, and dont get fooled by adds like " 1000s worth of software installed " but not a single disc or product key of the installed software ...so absolute worthless and more likely torrent downloads
but to be fair no electronic device will last forever , not even a Mac ....ok my twentieth Anniversary Mac is working as new and already 13years old so is my PowerMac 5500/275 , My iMac G3 700mhz too does not show any signs of breaking down soon and is nearly 10 years old ..touch wood
my intel iMac core duo build in 2006 shipped in 2007 is a prime example , in the last month of apple care he got a new display, a new powersupply,a new logicboard incl.graphics card as the graphic card is soldered on the logicboard , a new optical drive and a new harddrive , so internally apart from some wires and cables is just about a year old now

and i bought it of a trustworthy apple certified repair technician , it was pampered all its life with absolute no signs of any wear and i payed near half what some at ebay are asking