weighting boat for first time.

So I just bought a SV-211 crossover and can't wakesurf without holding the rope and its getting annoying so I'm thinking fat sacs?

I was thinking this 725 lb bag
http://www.amazon.com/Wakeboard-Boat-Single-Launch-725lb/dp/B001T3YKIK/ref=sr_1_3?ie=UTF8&s=sporting-goods&qid=1243825100&sr=1-3
for $110 shipped

anyone know what pump i should get?
looks like the Uber Pump is the way to go?

trying to spend under $200 so keep that in mind for recommendations, then maybe i will spend more in the future.

Thanks for the help :-) !!!!!!

I have this exact same sac. It is a good sac and I have had no issue's with it. I also bought an uber pump to go with it. Fills and empties fast. However, now I am ready to hard wire and plumb my boat so I don't have to hand fill the sacs. There are much better sacs out there if you are going to eventually plumb them in. Like this is top of the line for only a little more money. http://shop.maxwake.com/product.sc?categoryId=3&productId=30

You can hand fill this bag as well and then later you can hard wire it in without problem.

Spend the little extra money now and you won't have to do it twice. You will not be sorry.