Originally Posted by loopmd
it's steeping grains in a grainbag and then adding the extract.
Sorry, but that's not partial mash. That's steeping with extract. Partial mash is basicallly the same as all-grain except you still add extract to the boil. IMHO you might as well skip the partial Mash and go straight to AG. I mean if you're going to go through all the trouble of mashing, sparging, etc, you might as well get enough sugars out of that so you don't need to add any extract.
However, if you don't feel like going the AG or PM route, there's plenty of other things you can experiment with. You could try brewing a lager. Of course you'd need some kind of way to keep your brew cool for this. Or you could try brewing a "big" beer like a Belgian Dubbel or maybe a mead.
Or maybe you could just try and formulate some recipes of your own, instead of using kits. Do some research online, maybe get yourself some brewing software, and brew some recipes, but maybe change the hops alittle or steep a different grain or add some honey or some fruit or whatever. Basically there is no "logical next step" Do what interests you.