i'm new here, that looks like a fuckin cool forum. Just about to buy my first soldering iron ever..woohoo...very emotional. I understand i need one with a really small tip to be able to reach circuit board properly but have a friend who fixed amps and stuff and told me he uses a bigger tip for that...so ideally i'd like to get one where i can change the tip so i can do both...not clear from amazon or ebay which ones let you swap the tips... any suggestions?
Just about any decent soldering iron will let you change the tips, mainly due to the fact that sooner or later any soldering iron tip will get coated in crap despite your best efforts and will have to be replaced.
I appear to be mainly using one of these at the moment http://www.xytronic.com/pi/p-200pt.htm which has an easily changed tip just by unscrewing the barrell shaft that holds the tip in and sticking in a new one. To be honest i only very rarely change the tip for different projects and mainly use a 1mm chisel tip i think