Any speedo will do really. My advice is to find one that you are comfortable with using. My viking windsor had a speedo on it from aldi and it had everything I needed (always on sale around easter). One tip is if the speedo you chose has a heart rate monitor on it leave the belt at home because after a days cycling the chest belt tends to be uncomfortable and will probably spend the rest of your tour in the bottom of your panniers. Try a good bike shop that dont mind showing a selection to you and spend only a reasonable price on it, so if it gets stolen off your bike you wont have broken the bank. Cateye computers seem have a good reputation.
As far as distance do a few trial runs (with all your kit)and find out what your body is capable of doing as cycling unloaded and loaded are two very different things indeed. Set yourself a goal of around 100km-150km a day which is around 60-90 miles but be leniant on these targets as its far better to enjoy the ride and do 50 miles than to traul into a campsite absolutely knackered and think to yourself "my god what am i doing I must be mad. Ive got to do this again in the morning". This comes from experience and remember its sometimes not about the destination but more about the journey the path takes you.
One more thing is about the sealant they put in the inner tubes. My experience is that two of these can weigh more than three normal inner tubes and I believe that investing in really good tyres such as schwalbe marathons would eleviate many small puncters. A spare inner tube is a must as its easier replacing an inner than being sat at the side of the road mending a puncture. In the last 4 years I have cycled over 6000 miles and have never had more than 15 punctures. When you get to a rest stop you can repair your tube at your leisure. Hope this information has helped and good look with your ride.
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