An AES with a proper Converter and a multicart can be the cheapest way now, a decent used AES is around $250-$350. The converter is gona cost you but now some of them have built in BIOS now. An AES outputs RGB right out of the box so SCART to a RGB converter and your set like a turbo Vette.
A consolidated 1 Slot may be a good way to go as well, but it's so nice to have an AES with a huge Cartridge Sticking out of it, very nice system to look at.
The RGB output in AES systems is inconsistent. Even if you get one with better RGB output, it's supposed to still get better with a mod. Conveters are also all over the place and pricey. If AES systems are really that expensive now, then it would be cheaper just to buy an Omega cmvs and not deal with all the extra cables and potential issues. It looks and feels nice and won't scratch or crack so easily and looks much better without a transcoder and second power supply hanging off the back.
With that Omega CMVS, can you still use the normal AES stick? And the NGCD pad as well? Always wondered that and never really knew, because then with the Omega, you'd just need some sort of controller if it didn't already come with it.
I have also seen some Omegas with or without the memory card capabilities. Along with rgb/s-vid mods. I've been thinking about getting an Omega CMVS, they look nice and seem to have everything i would want (as i stated though, if it had it all built in. Unibios as well? Not sure)
I want to say that MOST of the CMVS conversons I have seen
mostly the Omega (which you can buy just the shel minus the NEO GEO One Slot if you preffer) and the Analouge CMVS support the AES controller, and the Neo Geo CD controller as they are the same plugs.
The Analouge CMVS does not support the memory card that the AES used (and the MVS Arcades), but you can buy one with a memory card in the system or send an older CMVS (before they made the "slim" model) to have their memeory card put in for game saves and I think Bios save states. I will need to do this one day as I bought the first run of their CMVS before the slim model or the memory card option.
I am not to too familiour with the Omega but if you go/join the Neo Geo Forums the creator/seller of the Omega has a thread and is very approchable if you have questions.
If you do deside to go the MVS route you'll enjoy it....it can be customized to suit your needs, and looks really good in any gaming room. The games are also much more affordable, and like the AES just be carefull .....do research on the game and compair the game boards to verify if it is a boot copy or a legit copy....
I have also found going MVS allows me to just keep the arcade verson and not mess with any ports of the games that honestly couldn't handle the games like an arcade could.
I did buy some of the SNK compilations for the Wii and Xbox, but that is because these (to me) are perfect arcade ports/emulations that make wantign to play a compilation of games easyer then useing my MVS at times. Although I am still missing the Wii port of the Metal Slug franchies...I need to pick that up one day, but I keep waiting to find it in the wild....might just ebay it if I can find a good bundle deal on some other Wii games I am still looking to add to my Wii Library.