I would get one with a DVI at the very least.
From click here:
There are two significant advantages of HDMI over DVI:
1. HDMI sends the audio and video signal in one cable. DVI only transfers video so a separate audio cable is necessary.
2. HDMI is significantly faster than DVI, which means more information transferred to your TV screen.
If you're going to use external speakers, then point 1. above wouldn't really matter too much.
These days a monitor with a HDMI connection isn't much more expensive than one without, but does widen one's connectivity options. E.g. it can be easily & directly connected to an external appliance that also sports a HDMI port: Freeview box, PVR, various games consoles (although the appropriate adapter/cable would suffice with the latter if using external speakers for audio). G