Your Thomson Tivo can only record (and output) a SD signal, so if you want to upgrade to HD then unfortunately that also means replacing your existing Tivo. While using the SCART (RGB) connectors can give slightly better picture quality, it is not HD, and is not worth spending the money on a RGB to component converter.
Some HD PVR options include getting a TivoHD, a magicTV, or building a media centre PC. All of these options seem to have bugs/limitations, so it depends on exactly what you want as to which is the best for you. Since you will be familiar with using a Tivo, Telecom are currently selling the TivoHD for $499, but the home networking package is not included ($129 from mytivo.co.nz), and there is no guide data for Prime/Maori.
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