As Ant says you may, (Should!), get some goodwill out of MINI. If not check out this thread as there are some recon prices etc. in it to give you an idea. If I was in your situation I would probably go for the 6 speed Getrag conversion 1320 autos offer. See the links below.
http://www.mini2.com/forum/faults-fi...expensive.html http://www.mini2.com/forum/faults-fi...onversion.html
1320's price included in link below but this may be out of date now.
http://www.mini2.com/forum/3052570-post6.html
Good luck and I hope it's not to expensive for you.