Tele Vue are premium quality eyepieces and are tested to f4 but will work equally as well at f8. Should you ever get a faster telescope (f5 is common), Tele Vue eyepieces will perform exceptionally whereas other eyepieces not designed for fast focal ratios will fail to deliver sharp images at the edge of field in particular.
Do you currently have a low power eyepiece say 25-40mm in 2" format? If so may I suggest the following:
Tele Vue 19mm Panoptic giving 63x and 1.0deg true field with 68deg apparent field. Eye relief is 13mm and exit pupil will be 2.4mm.
Add a Tele Vue 2.5x Powermate and you will get 157x and 0.4deg TFOV and 68deg AFOV, ER=13 and EP=0.95mm.
157x is excellent for Jupiter and Saturn and although your telescope can take more, you will be pleased with the images at 157x. You can always add more later but start with the above quality items to fall within budget.
If you do not have a low power option then either get the above and later add a 27 or 35mm Panoptic or if you want to keep the cost down and stick with 1.25" start with a Tele Vue 24mm Panoptic giving 50x and 1.3deg true field with 68deg apparent field. Eye relief is 15mm and exit pupil will be 3mm.
Add a Tele Vue 2.5x Powermate and you will get 125x and 0.52deg TFOV and 68deg AFOV, ER=15 and EP=1.2mm. This will allow (just) a full lunar disk at 125x.
125x is quite good for Jupiter and Saturn and although your telescope can take more, you will be pleased with the images at 125x. Once again you can always add more later but start with the above quality items to fall within budget.
If you get the 2.5x Powermate, ask for the newer version which is threaded for 1.25" filters. The previous version was not.
The Radians are excellent choices should you want the 20mm eye relief.
Whatever you choose, enjoy!
Look at
http://www.televue.com/engine/TV3_Page.asp?id=79 for more info.