I think it all depends on what your looking for mate. I personally would go for the Focus as you have a warrenty with it! plus to get a massive power gain in the fez you'd be looking to spend quite a bit. Focus is prob a bit more comfortable to drive than the fez, more room etc.
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Used to have: Fiesta 1.3LX, BMW 318iS E30, BMW 323i E36 and now a brand spanking new Fiesta ST.