You could also replace your 25mm Plossl with a 24mm Panoptic and add a 2x & 3x Tele Vue Barlow or preferably a 2x (2") & 2.5x (1.25") Powermate to retain eye relief and ensure no vignetting (although I'm not sure if the Barlows cause vignetting with the Pan).
The Barlow option will give you 24mm, 12mm & 8mm at 68 degree apparent field of view. The 2x & 2.5x Powermate option will give you 24, 12, 9.6mm
In fact a 24mm Pan plus 2.5x Powermate will nicely replace your 25mm & 10mm plossls and give very similar powers. You could add a 19mm Pan and get 7.6mm with the 2.5x Powermate or add a 16x Nagler and get 6.4mm giving 187x which would be a nice moderately high power on planets.
If you go the 2.5x Powermate make sure you ask for the latest one which is threaded for filters since the previous 2.5x model was not.
If you prefer Naglers then the 20mm T5 will give you slightly more true field than the Panoptic at a higher power and of course greater apparent field but is 2" and cannot be used with the 2.5x Powermate. The Powermates are available in 2" as 2x & 4x but are heavy.
See
http://www.televue.com/engine/page.asp?cat=2 and look at the specification page for eyepiece details.
One thing I would recommend is a Paracorr since at f4.7 you will notice coma although you may not be bothered by it. However, without a Paracorr, dont expect to get pin point stars to the edge of field even with expensive eyepieces since coma is a function of the primary mirror and not the eyepiece. A Paracorr will correct this and 'tighten' the star images dramatically but it will increase your focal length by 1.15x. The are a few Paracorr models but only the latest or previous tunable top model should be considered for visual use for its ease of changing settings with different eyepieces.
The Paracorr will also add a bit of weight and if you add a Powermate and 20mm T5 you will likely have to re-balance the telescope. You could probably leave the Paracorr out when using the Powermate.
Also have a look at
http://www.televue.com/engine/page.asp?ID=221 for some Tele Vue recommendations.
As you can see the choices are numerous and if you can get to a star party and look through some of the eyepieces you would like the choice will become a little easier.
A 20T5, 13T6 & 9T6 and Tele Vue 2x Big Barlow is a very good selection.
If you prefer the lighter weight then your choice of 16T5 is good and add a 2.5x Powermate you get an eyepeice with over 1 deg field at 75x plus one giving 187x for planets.
Just to clarify the 1.15x factor with the Paracorr. Basically your telescope becomes 1200 x 1.15 = 1380mm focal length.
Whatever you choose, enjoy!
