The only "investment" in this hobby is upgrading a machine you like to a state where you'll like it better or it will meet your needs better.Well I see a lot more macs out there, so the Apple IIGS may be a better investment.
About the CRT: using an LCD with the IIgs would be painful. Possible, but painful, if you plan on doing any GS/OS. You pretty much have to have the RGB CRT.
From a technical standpoint, the Mac II is a way better computer. The Mac LC is a better computer. Even a plus is faster, and stalls a heck of a lot less than a IIgs, even one with an accelerator in it.
For the OP and others + general repetition of my same thoughts:
A IIgs is an older system that's particularly weird even in its original context and compared to a Mac, requires more background knowledge and more infrastructure on your end. The only reason I was able to get mine going was because I went to a conference with a bunch of people who brought all of their Apple II gear along.
It's not a bad computer, but it's not one I recommend without qualifications to somebody, on a Mac site, who generally shows signs of having relatively little background knowledge about Macs from the '90s, let alone Macs from the '80s or Apple IIs.
If you're into Macs, that's great, I would be careful if you also want to get into Apple IIgs.
In general, the ways to get a good IIgs or IIe with upgrades are to be lucky, or to set aside a few hundred dollars. Even though I got my machine for free, I've got a bit of money into it, buying the RAM card (for 5M total) and the IDE card + CF adapter + CF card. I think all that in total was around $100, not counting the few thousand I spent taking a week off work and going to KansasFest, which was also the most practical way to get it running.
Also remember that while an Apple IIgs running GS/OS may "feel" like a Mac -- it's still gonna be slower, even with a good transwarp.
Honestly, I don't recommend it unless you have a very specific itch to scratch with that one machine, you have a lot of available money, you can make it to KansasFest, you get extremely lucky finding one on the local CraigsList, or you have some other kind of local resource to help setting one up.
And, to really be useful for much more than (slow) HyperCard or a (slow, incompatible) text editor, you will want upgrades. GS/OS barely boots on its own, with drivers, in the RAM on a ROM03.
As Gorgonops says, compared to basically any of Apple's own monitors for 68k Macs, the IIgs is a painful mess. The weird graphics mode just looks bad, especially if you have any of Apple's Trinitron displays, at 640x480 or higher. Although Mac OS feels more spacious on, say, the LC-matching 512x384 color display as well.
GS/OS has a few neat applications, but unless you're in it for Tass Times in Tone Town, there's probably not a whole lot that makes a IIgs a must-have, unless you're in it to catch 'em all.
To add to the point about the FloppyEmu: I considered it before I got the IDE card I have in mine, but without a driver, that device will slow things down even more. The IDE card itself sped up massively when I installed the driver, so I dont' really know the impact FloppyEmu has on the system's performance.
That said, you may end up spending $100 or so regardless of what storage solution you end up with.
A few of the IIgses I saw at kansasfest were being used as more convenient 8-bit Apple IIs that already had a lot of upgrades installed, just as has been mentioned. For that you can throw a IIgs in your airline carry-on and when you get to Kfest, buy a small television from Walmart and use the first ADB keyboard you happen to find on the give-away pile, without needing to go to an emulator, which some people do.
Perhaps this is because IIgses are easier to find than IIcs.



