Many nowadays mainstream synths have FM capabilities. But they do emulations of FM as in oppose to real FM A-Z kind of synthesis.
DX200 is a pretty advanced box. From FM point of view anyway.

And I think workstations like S88 and MOTIF offer some interesting sample processing capabilities. You'd be amazed with what a simple sample time stretch can do to a sound.
As for sequencing - don't worry about it. You'll learn. Get CUBASE and keep on trying - you'll become pretty good. I guarantee that.

ED