I think a table saw is the only way to go, especially for cutting smaller pieces.
If you are only cutting 3/4" stock, you could get by with a cheap (about $100 new) table saw.
A circular saw and a home made guide, would be fine for longer cuts on wider pieces.
I have a cabinet saw, but at a garage sale, picked up a cheapo Ryobi, "table saw for $10 and use it when out of shop and need a table saw.
Setting the fence takes a few seconds, but it would be much easier then using a hand held saw for accurate cuts.
When living on my sailboat, I made a "table" saw, from plastic milk crate, with a board on top, with circular saw bolted below. A routed groove for a miter gauge, and a straight piece of wood to clamp on as a fence.
If you expect to be ripping certain sizes again and again, I would save a sample piece, of each size. Then next time, lay the sample against the blade, and place wood fence against it, and clamp down. Before clamping rear of fence, move it just a hair away from the blade to prevent pinching and burning.
I thing any kind of "table" saw would be much better than a hand held saw, especially cutting short pieces.
Blade Runner? Jig saw mounted under board. Much too much blade flex for great cuts. If you think you want one, why not buy a decent jig saw, and bolt under a piece of wood, and if needed can be used with out being mounted. But it won't get the quality of cut you need.
For wide pieces a hand held circular saw will work fine.
From what I have seen a Blade Runner is a jig saw mounted under a table. Very easy to make. But not something you would want to make perfect straight cuts with.
Let us know what you decide on and how it is working out.