Thank you very much Dave,
the problem is that I live in Greece and Amazon does not ship any electronic equipment there. I found hakko 936 at ebay and it's 50$ cheaper than Aoyue 968 (including shipping), that's why I am asking if it is worth to pay 50$ more for a 3in1.
I'd say it really depends on how much hot air work you plan to do. I was facing a similar choice a while back and decided that I'd get the 936 and fish around later for hot air and vacuum tools if I needed them. In my case it proved to be the right thing to do, as I've learned to solder and desolder (with wick and two different sizes of hand held vacuum) well enough to do the larger surface mount stuff with just a small tip. If you're trained and used to hot air, or you plan to need it as much as you need a regular iron, then it might be a good call. I actually spent as much on my first batch of supplies (good solder sucker, solder, a larger and a smaller tip, liquid flux, flux pen, desoldering braid, and more) as I did on the 936 itself, and I think it made a huge difference in how fast I learned.
I also found out that Hakko 936 is discontinued(Hakko FX-888 is its successor), will there be any problem with that? (for example not enought tips, support etc)
I checked Hakko's site and
they're not cross compatible, which was a bit of a surprise. It's likely that you'll be able to find parts for several years to come, as the 936 has been a production iron in Asia and across the world for . . . something like a decade or more? Hakko's manual lists part numbers for every washer, bolt, and plastic doohickey for the iron, and there's a lot of inventory out there. I'd recommend avoiding the no-name brand tips if you can, I'm not sure I'd trust them the way I treat tips.
The FX-888 looks like the direct successor as ordained by Hakko, and is likely an excellent investment. I'm very impressed with their design and support, and I'd recommend either one to someone starting new. A soldering iron is part of my holy trinity of electronic tools along with a scope and a meter, and I'd recommend spending the extra cash for quality, single purpose iron. Of course, this is just my opinion.
Hope that helps.