Using stative verb "want" in progressive

Solution 1:

We'd been wanting to go to New Zealand for years, so sixtieth birthday was a good excuse.

This a correct, as the continuing action is explicit in "for years". It suggests the "wanting" is past and over.

We wanted to go to New Zealand for years, so sixtieth birthday was a good excuse

This is also correct. It suggests both "wanted to go" and "sixtieth birthday" have past.

We're wanting to buy a new TV, but we are not sure what to get

This is grammatically correct, but suggests that the prospect of "buying" is immediate. The continuous (or progressive) construction suggests the action of "wanting to buy" is "right now".

We want to buy a new TV, but we are not sure what to get

This is also correct. What is called the (simple) present tense suggests only that the action is current, and has no definite beginning or end.

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