The MFB Urzwerg or urzwerg pro is capable and I prefer it over the darktime, it doesn't require any mod done if I recall correctly.

Look no further than this one by altitude, I can vouch for his work personally and he strived to replicate the 303 internals to damn near perfection with this silver beauty.

http://www.vintagesynth.com/forum/viewt ... =9&t=54862

But hurry it's his last run.............