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Steve (Unipol) has a number of Televue Radian eyepieces for sale in the classifieds. There is a 12mm Radian there for $240 which will work well on both your scopes. He really looks after his gear so you should get a mint condition eyepiece.
A new 35mm Panoptic will cost you $559+post. It will give you a 0.75 deg field of view with a 2.3mm exit pupil and 77x.
It will also give you a 7mm exit pupil on your f5 with a 2 degree field.
At f15 your Mak is quite forgiving of eyepiece design. The GSO superview eyepieces at $89 should perform quite well with the Mak. The 42mm will yield 1.06 deg at 64x with a 2.8mm exit pupil, the 30mm will yield 0.76deg at 90x with a 2mm exit pupil. These eyepieces are less well-suited to your f5 and the 42 and 50mm eyepieces will probably show a dark spot in the centre of field from the diagonal mirror.
Joe
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