I'm not exactly sure what you're after, and as a beginner myself there may be better advice, but I've built a couple
Elenco XP-720 kits and have been pretty happy with them.
That's not my page or build in the link, but on my second build (which I just finished today) I made most of the same modifications shown on that page. My first one was built completely stock and is really just fine as is, but I liked it so much I thought having a more precise, "ultra durable" (the caps I installed are rated for 7-10k hours @ 105C vs the likely 1k hours @ 85C included in the kit) upgraded version would be nice, hence the second build. Besides, power supplies are useful, right?
The kit can be picked up from
Amazon (in the US) for $50-$60, usually, so it's not too bad, especially since it provides for an afternoon or two of fun putting it together if you don't rush it.