I think these are pretty accurate, but won't guarantee it. Was going to do 2 through 5 as well, but getting sleepy.  I'll just do a short run on those

6th Seed

Portland wins the 6 seed by:
   1) winning their final two games
   2) beating OKC, losing to Golden State, and getting one more Spurs loss
   3) losing to OKC, beating Golden State, having OKC lose to Memphis, and having the Spurs go 1-1
San Antonio wins the 6 seed by:
   1) winning their final two games and getting one more Blazers loss
   2) splitting their final two games, getting two more Blazers losses, and one more Thunder loss
OKC wins the 6 seed by:
   1) winning their final two games AND getting one more Spurs loss
   2) beating Portland, losing to Memphis, and getting two more Spurs losses

7th Seed

Portland wins the 7 seed by:
   1) beating OKC, losing to Golden State, and having the Spurs win their final two
   2) losing to OKC, beating Golden State, having OKC beat Memphis, and having the Spurs lose at least once more
   3) losing both, but having the Spurs also lose both
OKC wins the 7 seed by:
   1) losing to Portland, beating Memphis, and having the Spurs lose their final two games
   2) beating Portland, and ending up tied with San Antonio
San Antonio wins the 7 seed by:
   1) winning their final two games but having Portland win its final two
   2) splitting their final two games, and having Portland lose its final two
   3) splitting their final two games, and having OKC lose at least once more
   4) losing both their final games, but having OKC lose both its final games

8th Seed

Portland gets the 8 seed by:
   1) losing to OKC, beating Golden State, and having the Spurs win their final two
   2) losing their final two and having the Spurs win at least once
San Antonio gets the 8 seed by:
   1) losing their final two games and having OKC win at least one
   2) splitting their final two games and having OKC win both theirs and Portland win at least one
OKC gets the 8 seed by:
   1) losing to Portland and having the Spurs win at least once more
   2) beating Portland, losing to Memphis, having Portland beat Golden State, and the Spurs split their final two

2nd Seed:

Dallas controls this. Win their final two, and it's theirs.  Split their final two and it is still theirs, so long as Utah loses once more.  Their are other ways for them to still finish 2nd, but they are pretty unlikely
Either Phoenix or Denver can take this by winning both their remaining games and having Dallas lose both theirs.
Utah can take this by winning their final two and having Dallas and Denver lose once each 

3rd Seed:

Phoenix controls it's own destiny here, since they play both teams they are fighting against. Win both, and the 3 spot is theirs.
Dallas falls to 3 if they lose once and Utah wins out
Utah takes the 3 spot by winning both and getting a Denver loss (but no Dallas losses)
Utah also takes 3rd if they beat Phoenix, lose to Golden State, and get two Denver losses
Denver takes 3rd if they finish in any 2 or 3 way ties with Utah and/or Phoenix

4th/5th:

These are largely determined by figuring out who gets 2 and 3. The other two teams will fall here, with homecourt possibly resting on the tiebreakers

Short Version:

Dallas controls it's own destiny on the 2 seed. Everyone else needs help to catch Dallas
Phoenix controls its own destiny on the 3 seed
Denver can leapfrog Phoenix by beating them, and has the tiebreaker on Utah and on the DEN/PHO/UTA 3-way
Utah can leapfrog Phoenix by beating them.

Phoenix @ Utah on closing night will matter, no matter what happens before then. They both will be playing for the 3 seed if Phoenix had beaten Denver the night before. It's possible the 2 seed could be up for grabs (much more likely for Utah then Phoenix). Even if Denver had won their final two games,t he teams will be playing to determine which of them gets homecourt against the other in round one.

Tiebreakers can be found here

REMAINING GAMES - WEST