Originally posted by bdery The 610, St or Super, will suit your needs fine. Many people say you should go for the Super, but if money is an issue, the ST will still serve you well.
The biggest drawback of the non-super is the lack of HSS. For about 50-60$ more you can have a much better flash. It's not money saving if you have to re-buy a flash later when you need the missing features.
For the best flash info you ought to visit
The Definitive Guide - Pentax P-TTL Flash Comparison with a nice
table of flash features
The Metz 50 AF-1 may be the best value, has all the features needed and even has an USB update port in case there would be incompatibilities with newer bodies (I had this issue with a Sigma flash, had to send it for update and cost me almost 100$).
Or get an used Sigma 500 or 530 Super, although you have to be careful with the 500 because it needs to have its chip updated for wireless compatibility.
The Pentax AF-360FGZ is not that expensive and will have less compatibility issues.