short focal eyepieces

This is the first time I'm posting a massage in this NS. I love
astronomy by a long time, since I am a little child!!I discovered this
NS a few weeks ago. Now I have a question.
I have just purchased a short apo 80 mm Pentax 75 SDHF. I spent many
hours in internet reading test of this telescope...i love both
observing and photographing the sky. I have 40 mm konig ,22 mm ED,
15.5 mm Swarowski,and 8 mm LVW eyepieces; now i would a short focal
eyepiece. I am interested by Vixen 5 LVW (230 euro), Pentax 5 XW (350
euro) and Televue Radian 5 (330 euro).
omeone perhaps can help me in choosing the right eyepiece!!