Desalvo,
The phono pre is very important. I have no experience with phono stages with volume control which aren't megabucks, which is why I suggested an older pre with a phono stage. Others could help you better than I on that point. As much as I think phono stages should have their own attenuators (and balance controls), that's basically not the way it is done, so I have been stuck with phono stages into the pre as well.
I have no experience with the three tables you have in your garage, but knowing some of the slightly higher-range but still lower-end Technics tables, I would say the SL1800 is no great shakes. If you are not going to use those three tables, I'd sell them (they're not worth much to anyone sitting in your garage) and that would help finance the purchase of the new analog set.
As to the potential footfall problem, you might consider a table with a built-in suspension.
The phono pre is very important. I have no experience with phono stages with volume control which aren't megabucks, which is why I suggested an older pre with a phono stage. Others could help you better than I on that point. As much as I think phono stages should have their own attenuators (and balance controls), that's basically not the way it is done, so I have been stuck with phono stages into the pre as well.
I have no experience with the three tables you have in your garage, but knowing some of the slightly higher-range but still lower-end Technics tables, I would say the SL1800 is no great shakes. If you are not going to use those three tables, I'd sell them (they're not worth much to anyone sitting in your garage) and that would help finance the purchase of the new analog set.
As to the potential footfall problem, you might consider a table with a built-in suspension.