I understand that people would like to have a companion piece to the TOS Enterprise. Unfortunately, while the 11 ft Enterprise model has a wealth of detail, the 29 inch D7 model has a paucity of such detail. As such, the stark difference in detailing between the two would make them seem to be mismatched pieces rather than companion pieces. That's why I said the TMP Klingon ship would be a much better idea, since the level of its details would match those of the TMP Enterprise.
They are much better companion pieces for one another.
I personally chose the TMP/Refit version of the Enterprise as the next TOMY offering partially because that is my preference but partially as a strategy. As both VitalNonsense and animator say, having the next one be profitable is a very important goal to keep in mind, since that would help the line to continue *past* these first couple ships. However, contrary to animator, I think a safer bet, sales-wise, is the TMP Enterprise, not the TOS D7. That's because, regardless of how 'simple' a model might be to make, there is a definite *minimum* number of models which MUST be purchased in order for that ship to go into production. And since the TOS Enterprise really struggled to reach its numbers (numbers which had to be reduced to near the basement of that minimum), it is highly unlikely a *far* less popular ship (like the TOS D7) would reach that minimum. As animator correctly states, "there is a much bigger market for a Refit" than for the TOS D7. That being the case, it is far more likely the Refit would reach the minimum required orders - and thus guarantee the continuation of the line to a third ship and beyond.
Concerning the other options that were offered, I certainly like the idea of a TNG Enterprise. I would be very curious to see what TOMY could do with the design. And if it *is* produced, I will likely get one. But, on a personal level, the TNG ship always felt less 'real' to me than the TOS Enterprise. Given its supposed size, the D just didn't have the appropriate 'weight' and 'heft' to it - if that makes sense. Though it wasn't CG to begin with, to me the D always *felt* like it was CG (at least on television). That's why I prefer the other ships (aka TMP Enterprise and TMP Klingon ship).
Finally, regarding NuTrek and its kitbashed, mal-integrated designs, they have no appeal to me. I am simply not a fan.
All of which is why I chose the TMP/Refit version of Enterprise as my uncontested first choice, and the TNG version of Enterprise-D as my distant second choice.