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I have the same 'scope and found that anything under 6/7mm is a waste of time except on nights with exceptional seeing. Bigger images yes, but less detail and much dimmer.
To fit Sir's budget:
7 and / or 9mm TMB Planetary II. A little hard to come by here but available from the US at about $65 each.
Meade 6.7 UWA - Surprised at how good this is.
Televue 8mm Plossl
Orion (Stratus?)/ Vixen 8mm LVW
WO SPL 6mm
A little more dosh will get you:
7, 9, 11 or 13mm Naglers. My 13 practically lives in the 'scope and takes barlowing extremely well.
Takahashi 7.5 LE or 10mm LE. Tighter FoV ( about 50*) but super-sharp with no colour or ghosting.
WO 7mm UWA.
I don't get on with Radians or Pentax XWs because I find you have to get your eye positioned 'just-so' or you get severe blackouts.
Were I you, I would pop for the 13mm Nagler and a good barlow (TV or Celestron Ultima) and never look back.
Happy hunting!
Peter
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