Over the years I've probably had 5-6 different rainsuits complete with rainboots. It seems like the suits that kept me the dryest always made me dripping wet with sweat as soon as the rain had stopped. And then there was the issue of fighting the rainboots on & off, and this was usually done on the side of a busy highway. If you're just riding home from somewhere, getting wet can usually be corrected as soon as you get home so there's no real harm done. But if you're traveling on the road and you or your boots get wet, you may end up riding in wet gear (especially the boots) for the next day or so. Not much fun.
The best rainsuit that I've used is anything that is completely nylon inside and out. I emphasize "completely nylon" no PVC or plastic anywhere. Stearns is one of the more common manufacturers but there must be others. The key here is nylon inside and out. It is very waterproof. Very lightweight so it folds up very compactly. And best of all, it breathes. You can wear it between the downpours without taking an inside the rainsuit sweat bath.
Also, I got tired of fighting with the rainboots on the side of the road, so I bought a pair of Cruiserworks leather completely waterproof riding boots. They're a little pricey but they work as advertised. I've worn them for several years in some real frog chokers and my feet have always stayed dry. And because they're leather, not vinyl or PVC, they breathe, no sweaty feet.
Unless you're planning to pull over every time you see rain on the horizon, or unless you don't mind riding wet, you should bite the bullet. Spend the money and get something that works. Every time you're riding in the rain and you're still dry, you'll be so glad that you spent the extra dollars. Gerry