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With a scope like that I'd have an ep that will give you the widest true field of view, which in your case is >2.5 degrees, and then work down from there. That way you can get all the truly large spectacular clusters in the fov. At that size even the pleiades will fit into the fov!
If you go for an ultra wide angle ep (ie about 84 degrees apparent fov) than you want about 30mm focal length. I couldn't afford a 31mm Nagler and so wound up with a Williams Optics 28mm, which is a classy ep but I suspect above your budget. There are cheaper ultra wides out there but I cant speak to their quality.
It's probably easier to get quality in the super wide class (ie 65-70 degrees apparent fov), in which case you're looking at about 40mm fl. Again. Panoptic (or Vixen?) are probably above your budget but I would look at the 42mm superview at Bintel.
In general remember that you may upgrade your scope, or end up with several scopes, but you tend to keep eps. So, don't buy too many but buy the best quality you can afford. When I decided to upgrade my eps I decided on a plan (what I wanted) and then watched the classifieds. It took several years but I managed to get most of my eps at about 75% of new price (I'm amazed at the things some people sell).
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