If you're in the US and think that by getting a scart TV you'll also get the best picture possible from your AES... well, think again. The latest 3 consoles I've received from my fellow Italian countrymen for RGB modding had serials ranging from 160xxx to 215xxx (my own is 177xxx) and the RGB output is always the same horrible line grid that makes you wanna throw heavy objects at your TV: what does it look like? Put a mosquito-net on the screen and you get an idea: unbearable.
The good thing is that all the home systems (including these high serials) can output the
same RGB as their arcade counterparts if you know where to tap the signals from (no Norton, it's not from the CXA chip).
Here's my posts where I show (with pics) how to mod both early and later systems (the PCBs are different):
Early AES revisions RGB mod
Later AES revisions RGB mod
As a final note I would like to stress that it's very easy to use an AES in an arcade cabinet: you don't even have to use the console power adapter as the cab PSU outputs the necessary voltages for both early and later systems (5V for the PRO-POW or PRO-POW2, 12V for PRO-POW3). It's very easy to make an AES-to-Jamma interface. Keep this in mind.