in need of lower unit

I'm in need of a lower unit for my '93 Johnson 150
if anybody has any ideas it would be much appreciated.
I'm likely buying a new one,if anybody has had any experience in dealing with a particular company? aftermarket / O.E. ???
any input much appreciated
thanks
tom

look at sei lower units
put one on my boat worked great and saved $2200

Thanks
I was looking at SEI before posting
decided to bite the bullet, its gettin into my fishing