Chris Busman is a member here that has done some great mod's on select gear. His BM2+ mod on the Edirol UA5 is top notch! many people swear by them. you can get a used digi mod UA5 for 150 or so and him mod it for about the same. WELL worth it IMO.
for what it's worth I've seen stok UA5's go for as little as $75 on ebay but that is not quite the norm...