Join Date: Jul 2007
Location: Newcastle, Australia
If you are after a floor unit, there are plenty available, including the Line 6 PodXt Live, the Boss Gt-8, the Digitech GNX-4, the Zoom 9.2tt, the Vox tonelab, and the Korg toneworks.
They all offer plenty of good tones and lots of tweakability.
But your best bet is to take your favourite guitar with you to every guitar shop in town, and try as many effects units as possible. If possible try it through the same model amp as yours at home to get a more accurate idea of how it will sound.
It's also worth noting that many of the default patches in effects units have extreme tones due to the manufacturer wanting to show off their various effects. A little bit of tweaking can make a crappy factory patch shine, so be prepared to turn the knobs and let your ears chose for you.
Personally, I really like Line 6, but I've tried most of the units I listed above, and I thaught they were all fine products.
Hope this has helped and...