Yup, I can vouch for Haverfordwest too. Great bunch, Gwyndaff is good if you can ever nail him down and almost always rushed off his feet. The airfield has some good ameneties and is a pretty friendly place. Not sure how to get there from Aberystwyth mind.
If you wanna see what they got go here:
<a href="http://www.flywales.co.uk" target="_blank">http://www.flywales.co.uk</a>