Top Hotel In Venice

What is a good place to stay in the SanMarco area of Venice?
Would like to stay in a hotel on the canal. Only two days. What are the top 10 picks of what to see? First trip.
I am sending you some website with all the best cheap rates:
http://www.prontohotel.com/ita/venice/pois/venice_city_centre.htm
http://www.venere.com/italy/venice/?ref=744612#o=default&r=0&m=0&f=C000100000000008&sb=1
http://www.booking.com/searchresults.en.html?aid=313633;sid=d4317f219b05fe804d9766a0bd6d1c29;class_interval=1;offset=0;score_min=0;ss_all=0;country=it;radius=0;district=620
I am sure you will find the right one for you
Spa VENICE: not just a luxury spa hotel in Abano Terme