Okay...in that case, this trip wouldn't really benefit you by renting the points...at least not for the Fri. night. The example I gave was based on an entire weeks stay from say a Sat. to the following Sat. but in Sept

It still comes out much less expensive than paying to stay at the Poly for 2 rooms. However,for individual days the points are much more expensive (as Sammie pointed out) per night for a Fri. night and/or a Sat.night and you'd need that Fri. night

If you only needed a Wed. night and a Thurs. night it would be less expensive but not for a Thurs. night and Fri. night.
Anyway, enough on that before it gets confusing.
As to your other questions about:
But, so I know, where are the DVC properties? And what are they? What does OKW stand for? Are any close to MK?
OKW stands for
OLD KEY WEST resort it's actually right next to Port Orleans French Quarter

The other DVC resorts are:
VWL (Villas at Wilderness Lodge) which is attatched to the WL (Wilderness Lodge resort) near the Magic Kingdom,
SSR Saratoga Springs Resort near Downtown Disney,
BWV's Board Walk Villa's (attatched to
BWI Board walk Inn) - you can walk or take a boat to both Epcot and MGM from there.
BCV'sBeach Club Villas - attached to
BC Beach Club resort - also walkable or boat to Epcot and MGM. And....off sight there is
VB Vero Beach resort 2hours away on the ocean in Vero Beach and
HHI Hilton Head Island resort in S.C.
Whew....that's all of them lol
If you were in our situation would you still think DVC was the way to go? I'm new to this so still not really sure....I've heard when codes came out last year for GVpoly, it was around 239, so a little cheaper if its the same. Thanks for any advice you may have.
If I were in your shoes and you were talking about a whole weeks stay yes...it's defenitly the way to go if you can find the right person you're comfortable with to rent points from as you can stay for much less $$ in much nicer accommodations. Even if it were just you,dh and the kids and got a studio you'd be getting more than you get in a regular hotel room and it can often cost less than staying in the moderates even. You may get a rate of $239 per night for the Poly like you have now but may be able to pay more like $800 for the entire week (which by the way is what a studio at OKW would cost for Sept. -- this would all depend on time of year & villa size but for comparison sake a good example) 80pts for a studio at OKW for 7 full nights = $800 @ $10 per point. vs. $1,673.00 Plus tax -- even without the tax you're saving $873.
Anyway, it's not something for this trip with your only needing 2 nights and it including a Friday night stay but for a future trip where you may stay for a full week...yes, I'd rent the points.