Which template system should I use ?

[eluser]miau[/eluser]
Hello,

I'm about to start a new project and I need to choose a template system for it.
I used Template Parser Class from CI and it was fine, but now I'll need some more functionality, like simple template logic:

Code:

[this is page template]
<b> blabla </b>
{if logged_in} Hello, {user} {else} Please login {endif}
...

I know smarty can do that. Anybody tried to use smarty with CI ? How about speed?
Or is there any other lib which can do that?

Thanks!
miau

ps. I don't want to use CI views with PHP code fragments, because it can easily lead to mess in templates. specially in teams