Billy, you answered the question yourself !!!! All you hear about is the Knife and Top Cap ! Both of them are Morris kits. So guess what your choice should be ? Correct ! A TOP CAP (cause you have the Knife already) ! Well I think their Sledge 540 will work also (my next profile after I finish building my Yellow Aircraft Sukhoi).
Seriously, if we all have such great results with our Top Cap's, why don't you try one too. From what I have been reading and understanding in your threads, I think you would enjoy the heck out of it. Come and join the Club, and do not forget to put a OS 50sx on it. It rocks !
Just my $0.02