Guess the final verdict for an oscilloscope will be the Siglent SDS2104x+. Currently looking for a deal on it and amazon doesn't have anything special for it and I think I saw some people mention tequipment gives deals or something for being in this forum.
I've got that Siglent scope, and it's fantastic. My only real complaint is that it can be pretty unresponsive to the front panel controls under some circumstances, but the touchscreen makes up for a lot of that.
I strongly recommend buying from a reputable vendor like Saelig, because (unlike Amazon, once you get beyond the 30 day return window at any rate) they will be willing to support you after the sale. Fortunately, Siglent is (unlike Keysight) willing to work with individuals for warranty claims and repairs in general, but even so, I'd go with a reputable vendor for any $1K+ piece of gear. Put another way, if it's something you can't sink the replacement costs for, you should buy from a vendor that will support you long after the return period expires and even after the warranty expires.
With respect to the Instek GPP-4323, that thing is $700! That's quite expensive for a hobbyist power supply, particularly given that it can't supply more than 3 amps per output channel (two channels can, of course, be combined, but at the loss of a channel). Unless you need very advanced power supply capabilities, I'd stick with supplies like the Korad KA-3005D (or the KA-3005P if you need programmability). It's inexpensive ($110 at Amazon for the 3005D), has low ripple due to being a linear supply, has good turn-on and turn-off characteristics (e.g., minimal overshoot), has memories, has the usual current and voltage limiting and protection, has milliamp current resolution, has a floating negative terminal (so you don't risk ground loops) and a separate ground terminal, and is solid. You're better off getting multiple supplies than a single one unless you need to be able to turn on multiple supply rails within milliseconds (or less) of each other. Since you're just starting out, keep it simple and get one of these.
If you need a power supply with
a lot more power output, you can consider assembling a Riden-based (e.g., the RD6006) switching power supply, but be warned that its protection capabilities aren't likely to be anything as good as the Korad's. The Riden-based supply isn't what I'd buy for the first supply, and is instead something I'd buy only to supplement a good linear supply like the Korad.
As with so many other pieces of gear, you're better off being minimalistic with respect to the power supply, getting something inexpensive but good, and going with something premium like the Instek only if/when you find you need the capabilities that are unique to it.
I'd say the same about a waveform generator. Stick with the one built into your scope first, and only if that doesn't do what you need it to do should you consider getting anything more.