Have you discussed with or approached the other neighbours to see if they would have an interest in contributing to the cost of removal. Tell them your concerns about it falling, blocking light, etc or do you think they would just say your property / tree, your problem?
For the 2k quote did that include you retaining all logs produced during removal or they take the lot? If you could retain them u could either sell off to recoup some of the expense or use to offset your own fuel costs later in the year.
Lastly what about contacting Coillte / forestry to see if they know of options or perhaps foresters who would be interested?