Benefit cards combination for Berlin

I am going to travel to Germany in a few days (for a total of 5 days, Monday morning to Friday morning actually) and I am striving in various sites to conclude on the best combination out of:

Berlin Pass, Welcome Card, Museum Pass, Weekly transportation ticket.

• Welcome card offers benefits but I don't see discounts or free passes on the major museums I want to go. I doubt I will visit the smaller ones, so is it worth just because it offers free transportation? Maybe worth because of the restaurants' discounts?

• Berlin Pass looks great, but are the ~100 euros worth it?

• Museum Pass is surely a great deal. Only 24 euros where a major museum might cost 10 euros on it's own. Are the additional 37 euros a good bargain for transportation (check next as well)? This is my main focus for now.

• My hotel is near Alexanderplatz. Will I really need to spend a lot of money in transportation if I want to explore the city? I enjoy walking, unless the weather is really bad (or the place weird and creepy :) ).

I am not sure which combination is more beneficial from a budget along with benefits perspective. Can people that have been there or live in Berlin shed some light? My budget is 50-60 euros and ideally I'm looking for just one pass.