What type of bike is appropiate for my situation? First off, sorry for being unable to phrase my question more precisely. Currently, I ride a 26" hardtail mountain/trail bike to and from work/university (around 7km each way). Surely, this is not the ideal bike, but I do love the ruggedness (occasionally jumping a flight of stairs etc.) and maneuverability. So I‘m not going to replace it entirely, but rather extend my fleet. 

Also, I’m considering doing a bike tour through Europe once I finish my degree (another two years until thats the case). In the meantime I’d naturally like to train, i.e. riding more than 50km at once, which isn’t nice on a trail bike. 

Also, I plan on building it myself, if that makes a difference?!

So here are my concerns:


Should I just buy a touring bike now? Seems they are too heavy for what I need now.
Should I buy a fixie? I’m surely not interested in being fashionable, but I read here that it helps develop a smoother pedaling style; that can’t be bad?!
Should I get clipless pedals? There are some which you can still use with normal shoes, is there a major drawback?


But mainly, what type of bike?

Edit: Based on the answers so far (thanks guys) I noticed that I wasn’t really clear. I don’t want to use this bike for touring, I want to get around town quickly and do a longer day tour with it, no need for carrying stuff.
If it were me I would buy a comfortable steel road bike with fenders and racks. This will give you a bike you can comfortable go distances on as well as practicality for the commute. You aren't racing so you don't really need an extremely expensive, high end road bike and a steel frame will be comfortable and durable assuming you store it properly. When you feel the need to romp around you can take your MTB out. If the road bikes are out of your price range then consider a similar setup with a single speed/fixed gear. Fixed gear bikes will make you pedal smoother but a disciplined rider of any bike can get the same benefits using cadence drills without the added danger of getting bucked by pedals moving faster than you can.