need opinions on rb 25 and 26

[1civic]

wich should i buy an rb 25 or 26, i just have enough for a 26 but if i got a 25 id have money left over, how much custom mounting would be necessary, any info about installation like if its just an insane amount easier for 25 or its the same and wat would i have to get for it to sit right in an 89 290sx

The RB25 is alot cheaper and easier to install than the RB26... E&E and TopHat make mounts, Also TopHat could do your Engine harness for you.. The harness is the hardest part of the install....Thats my

EDIT:
This is a Helpful link...http://www.meggala.com/partcss.htm