Stack a H-Beta with an O-III and you get almost nothing through as the peak wavelength and narrow bandwidth for each do not coincide. That's the whole idea to let through only the wavelength you are after. Note the UHC includes both H-Beta and O-III lines but stacking the latter two does not give you a UHC since each filter excludes the other one from its bandwidth.
Back to the original post, note the request was to put aside budget constraints.
I would also recommend the entire Tele Vue Plossl range for increased contrast and sharpness as an alternative to the other Tele Vue eyepieces I suggested earlier. Another option would be for some orthoscopics from Kokusai Kohki but it depends on what style of eyepiece you want.
I have briefly compared the 6mm Clave Plossl, 6mm Brandon Orthoscopic and 6mm Radian (and yet to directly compare the 3-6 Nagler Zoom) and I can tell you that out of all of these the 6mm Radian is the most comfortable with its big eye lens and plenty of eye relief and did not show me any less than the other eyepieces, (target was Jupiter at 273x through 10.1" f6.4). I do not have a 6mm Delos or 6mm Bintel/GSO Plossl to try.
Note the 24/13/9 combination for an 8" SCT is also recommended by Tele Vue at
http://www.televue.com/engine/TV3b_p...7#.U3A5-IGSy5I