Cheap tracks like that are seldom straight, typically not strong enough to resist flexing during use, and don't typically offer a zero-clearance cutline. I have worked with cheap guides, I didn't find them to be accurate enough for cabinetry, that's when I made my sawboards.
A shop-made zero-clearance sawboard is a better solution than buying junk if cheap is the primary concern. With care, a saw board can get you all the accuracy you need for a typical speaker project.
The difference between a proper tracksaw and a shop made sawboard is night and day though. With the sawboard, I broke stock down to rough sizes, then squared things and did final cuts on the tablesaw.
With the tracksaw (and I'll admit that I have a "cheap" one), I square the panel, then just cut to size. Cuts are as straight/square as I can measure.
A basic 60" EurekaZone setup would be $200 plus shipping. Add the UEG (without base, because you have one in the kit) for another $50. With this - ripping and crosscutting are covered. For my main saw, I use an inexpensive Skil HD5687 sidewinder. Might not be the best out there, but it is sturdy. That cost me $79 when I bought it at Lowes. Let's be fair and add another $15 for a decent 24 or 40-tooth Diablo or Bosch blade. I use the 24-tooth for ripping solid wood, and a 40-tooth for everything else when it comes to woodcutting. I have other blades that I use for other materials, like tile or aluminum.
That adds up to $344 plus some for shipping, but I didn't account for the discounts currently offered at EurekaZone, they might offset.
A simple cutting table can be built out of 3 10-foot 2X4s and rest on a couple of folding saw horses. That's all mine is. It will hold a 4X8 safely for ripping or crosscutting, and it takes next to no room when stored. When I wear it out, I can replace the cross-pieces with a new set for less than $10
It is totally possible to spend more on a tracksaw system. I know, I have. The simple setup I described will get you started though. If it works for you, you can add to it. If not? Well, I've spent a lot more than $344 on tools that don't get near the use I thought they would.