May I jump in? :-)
I am a dedicated collector of MSXs. They were HUGE down here in Brazil in late 80´s and early 90´s, all cool kids had one. Then Amiga came and destroyed everything.
Anyway, I digress. As I was saying I am a dedicated collector. I do own about 300 assorted boxed games. They are spectacular, almost every japanese game feels like a "collector´s edition" with hard case and loads of interesting printed material, from stickers (even bumper stickers!) to 100+ pages, full color manuals.
Spectacular, no less.
About the best "intro" system... I was talking about it with an American last month on MRC. Was it the OP of this thread? Dunno. :-/
So... There are basicaly four different platforms:
- MSX1: Simplest, common, cheapest. Some very interesting games specially when you look for the "MegaROM" ones. BTW, Opcode is porting those to Coleco + SGM. There is a lot of interesting games for it, a LOT of Spectrum ports, a lot of nice Japanese games - Not only JRPG! And forget about the language barrier, most of it you can play without any hassle. Bear in mind that MSX1 was a little limited (16 colous, 3 audio channels) so it might look like an NES with bad scrolling.
- MSX2: Now things get interesting. More colors, more RAM. GREAT games, some very interesting software around. And the computer can still be easily found.
- MSX2+: My platform of choice. 19268 colors, a special audio board (MSX-MUSIC, AKA "FM") and in most micros an attached 3.5" drive. With them you can play everything from MSX1, MSX2 and MSX2+, with nice audio. And since discs are compatible with PC all you have do to is create your discs directly on your PC an play, no hassle, no supernatural setups.
There are 3 companies that made MSX2+: Sony, Panasonic and Sanyo. I like the Panasonics, they are gorgeous. Sonys are cute. Sanyo... Errr, nevermind. :-) If you choose to grab a MSX2+ just be sure to grab one with MSX-MUSIC! There is one Panasonic and one Sanyo without it. I think all Sony had it.
Also you should look for a computer with 128kb of RAM, native or expanded. It makes a difference.
The last one is TurboR. There are 2 models only. They are *EXPENSIVE*, hard to get, and since they don´t use Z80 but R800 for extra speed there are some compatibilities issue.
I truly don´t think they worth the trouble. I do have one A1-ST boxed, complete (a TurboR model), but daily I use a MSX2+, Panasonic´s WSX.
Also you DEFINITELY should look for a flashcard. Take a look at this one from MSX Cartridge Shop: It is an IDE + flash cart + drive emulator + memory expansion + it have an extra sound chip, SCC, for Konami games. It is a must.
http://www.msxcartridgeshop.com/
With an MSX2+ and a SCC+ you will be able to play about 99.8% of everything ever made for MSX, including all of the best games.
It´s hard to look impartial here, I am a HUGE fan of MSX. :-)