Since you are used to Brother machines, I suggest that you look at some of the smaller Brother machines. I have a Brother PC420PRW that I love. It has the automatic needle threader, needle up/down function, lots of decorative stitches, comes with lots of feet and knee lift. It is light enough to carry to and from classes but is heavy enough that it doesn't move or vibrate when sewing. It can be found on-line for between $400 and $500.
If your budget is higher, then the Brother dealers offer some nice machines in the $1200- $2000 range that are smaller than your Quattro.
If you want a bare bones basic machine with a few utility stitches, there are a number of Brother machines that are sold at the big box stores for $100-$400' you will need to read some reviews on these to see if they would suit.
Rob