I think it's fine for the camera you have, especially without a w/a lens. The differences between the two are; DTTL (may or may not work with your camera depending on preflash), 13 exposure steps, as opposed to 8, wider beam angle with 3 flash tubes, faster recycle time, and upgradable for use with a DSLR with hardwired sync. Thats a lot for the $140 or so price difference.
You can always shoot close focus wide angle shots, lighting a foreground subject and using the available light to light the rest of the frame.
And, as you add to your system or upgrade to another strobe; use the YS27DX as a second fill-in strobe. Not as nice as having two matched strobes, but should work out ok, other than the difference in recycle times.
You might want to read more on my blog;
Choosing an Underwater Strobe for Point & Shoot Cameras
Jack