Given that you have a sub, the rear port may be less of an issue on the bookshelf. But as far as I know, Paradigm makes no bookshelf speakers with a front port. Are you sure about the Monitor 3s? (Maybe I'm just looking at an old catalogue, but I don't see a port in front.)
For a front port, you might try the PSB Image 2B or, if you can stretch your budget, the PSB Stratus Mini. Both are front-ported, and PSB tends to be a little more wall-friendly. PSB is generally as fine a manufacturer as Paradigm, so they're definitely worth a listen.