Buy two. One straight stitch only either Juki, BabyLoc, or Brother. All are made with the same features and you have the large throat space and they last for decade being all mechanical.
Get a second machine for piecing and decorative stitches. You can get both for about $1500 or less.
I wouldn't invest in a thousands of dollars machine for sewing quilt blocks. I rather have a new regular sewing machine every few years that I'm not stressed about it breaking or messing up and requiring hundreds of dollars of repair. Now if my piecing machine which is a Brother 420 (six years old) goes belly up no big deal.
I paid about $378, so it has cost me $50 a year. It has auto thread cutter, knee lift, needle position, neeld up/down, start/stop button or foot control. Low med and high speed settings and needle threader. Those are the features I want in any regular sewing machine and they are available without paying a fortune for them.