Thursday wedding... do or don't?

FH and I are having a serious issue with this. We are considering a July 1st, 2010 wedding (thursday) The price difference at alot of all halls was ALOT cheaper then our dream date. It is of course better for us because we are young and on a tight budget.

Alot of our guests are coming from about 2-3 hours away. They will need to take off work early on thursday and either go very tired to work on friday or not work on friday. Should I just say, they have an STD 18months before the wedding they can figure it out, im doing whats best for us? My sister and MOH is an investment banker and can never ever take days off work. She was flipping over a friday wedding and is now saying she doesn't think she will make a thursday wedding. If she can't come then im not doing it obv.

How wrong is it to ask people to a thursday wedding? I think they have enough time to plan for it. It is such a great savings & we must have a July wedding thats not up for change, FH is a teacher and much of our family is as well.