I have mentioned this before, but i figured i might as well bring it up here as well. :P
Mission 8 from Area 88 and Wily Tower 4 from Mega Man Wily Wars sound similar to me. Since there is no video on YT of this song, i had to record off of Jukebox and upload it, so you'll have to download if you want to hear it, sorry.
http://www.mediafire.com/?v9phmqqps7rcdr9
And Wily Tower 4
http://www.youtube.com/watch?v=Xx2V1I1RWCc
Also, Nitro Man reminds me of both a little bit.
http://www.youtube.com/watch?v=doxUxFsXCJs