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The seller does not mention the make of the boat, but by the deck and ski rope loop ...
http://www.kijiji.ca/v-powerboat-motorb ... nFlag=true

http://www.snowmobileforum.com/attachme ... 00x800.jpg

Hydrodyne...
Great ski boat from the 70's, made in Illinois. Mostly outboards but I/O's weren't uncommon, pretty sure there weren't any direct or Vee Drive ones made.
Roundish bottom made for a great low speed trick skiing wake an a very acceptable wake at speed for slalom.
The rot just like Hydrostream's

Yup Hydrodyne, learnt to ski behind one as a kid the guy still has it and its still like brand new,

For $700.00 complete it is reasonable

There's a couple of those restoration candidates out there, mostly in Quebec.
A better restored 165 I/O version for $3500 near Ottawa.
If I REALLY wanted one, I'd go for the I/O as it'd cost at least that much to re-core the others.

Here is a restored one:
http://www.kijiji.ca/v-powerboat-motorb ... nFlag=true

We used to ski behind one with a 235 Johnny Rude and a stainless 15P. That thing would rip your arms out if the pilot was being a Richard! Many a tank full was burned, great boat for the money. Now it's all direct or V Drive around here. I believe the boat in the add used to reside in the area as well.

Lots of ski camps ran them, many as twin rig 115's and even trips.

This company still makes a modern version, same bottom I believe.

http://www.dyna-ski.com/

Now a $400.00 one
https://www.kijiji.ca/v-powerboat-motor ... nFlag=true

Saw this one some time ago. Be a nice ride after complete restoration. Note deformation where hull contacts trailer.