I don't know where you are, but if you are in a country that can order from Marlin Jones (MPJA.com) (May be my or Dave's distant uncle) Their temperature controlled irons (ZD-929C for 7-segment readout, can't find the bargraph model on their website) are a good value. They are a bit more expensive than the cheao-o models, but they hold up well. (oops, they are out of stock at the moment.) MCM sells the same one (digital readout or bargraph) with their "Tenma" brand on it for a few dollars more. I have one of these at work.
MPJA.com has el-chepo hot air stations also.
MCM has a range of soldering equipment.
I personally use some govt. surplus stations - a temp controlled Weller, and an old Ungar station that I have a few spares for.
As previous posters say, it depends on your preference as well as how much you use one. I could never justify an expensive unit, although I'd love to have one.