LWJGL, java2D, JOGL?

I currently developing an isometric tile-based game engine using java2d…

So my question Is it better to port it to OpenGL using
LWJGL libs (OpenAL, FMOD etc…)
Is it worth it? I mean is it faster then Java2d besides
the platform scalability?

By the way: I am having a Radeon9000 Graphic Card with 64Mbyte VRAM and a 1.8GHz Processor…

P.S The current engine I am working on looks like that:
http://www.nullpointer.ch/pimg/index.php?showcat=1

Please don’t crosspost.