As far as linear P/Ss that'll do a good job with modular in general, keep an eye out for some used Acopian ones. You might also try getting one new, but keep in mind that that'll cost more.
O-scope? Check this: puAAAOSwXzdgXmcI" target="_blank">https://www.ebay.com/itm/174707999737?hash=item28ad6883f9puAAAOSwXzdgXmcI Notice that this also has X-Y capabilities, which is a must; you can then not only use the 'scope for working on gear, but also to check mix phasing via the X-Y display. Check this article out: https://transom.org/2016/its-a-phase-youre-going-through/ So even if that GW Instek isn't what you're looking for, keep in mind that you want a DUAL-trace scope that can do that X-Y display for stereo phase checking; if you do any sort of banger tracks, knowing what your low end is doing is essential, especially if you're planning to press a track to vinyl.