So here's how I'm looking at it at the moment. I welcome thoughts, corrections, opportunities I missed etc.
Up front best deal - Cabins at $25,000 after MB and other discounts, but $11.87MF (or $149/MO for 150 points). If this gets absorbed into LSL and MFs go down to around $9, this would be a fabulous deal. If it doesn't get absorbed into LSL, there's some crazy high fees (as cabins aren't cheap to maintain) and a contract that's likely not to hold its resale value. So there's a gamble there. Also the issues with the trust. Hidden bonus: these are the lowest point
DVC offerings with a kitchen by a lot. Hidden problem: there's only one room type which limits options at 11-month booking window.
Financially, RIV would be in the middle--more expensive than the Cabins up front, but with lower MFs, also with a sharp decline in value in terms of resale due to restrictions. There are multiple 150-ish resale RIVs right now for around $115 a point--which personally I expect to see drop a little more in the coming year. So I'm not breaking that one down. I think it's a great option if you absolutely love RIV. But, from different perspectives, Cabins or Poly are better deals.
Best sure long term deal - Poly at $29,500 after MB and other discounts, but with MF at $7.92 (or $99/MO for 150 points). No issues with restrictions. No issues with the trust. It's $4,500 more expensive than the Cabins right now. The MF delta is about $600/year. Assuming the MF price difference between Poly and Cabins remains the same, the savings in MFs would put you financially ahead in 7.5 years overall. If Cabins become part of the LSL trust, then it may take many years before this purchase is overall lower than Cabins. And for those who are young, Poly expires 2066 versus Cabins at 2075 (nine years less). Again, if you're 30 maybe something to consider; but if you're 50 probably not so much. Hidden bonus: Poly, without resale restrictions, is far more likely to keep reasonable resale value versus Cabins. Lowest 150-ish resale Poly contract is presently $160. Poly typically is one of the most expensive resale contracts. Hidden problem: With a mostly positive (but not enthusiastic) member reception of the Tower, it may be more difficult to book longhouse studios in future years.