SCART to HDMI converters suck, the only one that works well is the Framemeister, which is expenisve but a wonderful option for people who insist on ugly LCD displays with HDMI input.
A cheaper option is to use an RGB -> VGA upscan converter. Which is basically the rest of the XRGB/DISPL line. The one you want will vary on what you really want to play with it.
The cheapest option is an RGB CRT. A Sony PVM in the USA can usually be gotten for $50 or so depending on size. Here in Japan there are tons of old TVs witch take RGB, you just have to know what to look for.