Look, If you are IIT material and can bring any book and any complex question down to its knees only then take FINAR otherwise stay away from it.
I feel finar is way out of the course.
Out of solomon and morrisson generally students prefer solomon due to its concise and vast nature which makes it an ideal reference book.
Morrisson is slightly novelish. class XI student should stick with morrisson in the beggining and switch over to solomon if organic grows over them.
But above all these i feel the simplest and the most essential book for organic on your desk should be "Schaum's Outline" for organic chemistry.
It is a book with all essentials on orgainc plus a little more but with lots and lots of solved examples.
You could also have a look at "Reactions rearrangements and reagents" by S N Sanyal. See if the style suits you. Its only for 75 bucks.
To Sum it up i think you should take schaum (use it especially to cover organic in last 4 hours), and you could take solomon (mine went waste).However if you are interested in mundane number of organic questions then you could also consider ARIHANt ;-)..
cheerio... best of luck