From what you've described this sounds very similar to the Digitech GNX3! One thing I love about the GNX is that it has an 8 track recorder that you can loop guitar riffs with live and it also has an XLR mic input for the talkbox effect as well as looping vocal segments.
As for me, I'm definitely a digitech kind of guy...not because the store is a dealer for digitech, but because they seem to have really good quality equipment.
I recently bought a Digitech Vocalist Live Pro and this thing is sweet. I'll probably write a review of it here in a little while so I won't waste space here, but it's a beast!
As for guitar effects, I'm eager to see if
THIS UNIT will be any good. It will probably be pretty pricey, but it looks pretty solid.