The best of the cheapest easily avavliable plossls I have used are Vixen NPL.
Get them from Myatsro shop. Scoll down the page.
http://www.myastroshop.com.au/products/vixen-ep.asp
Or if you want to spend more the best Plossl combo I have seen is Tele Vue 32 25 20 and 15 with a 2.5x powermate...covers low to high power without the usual poroblems of short focal length plossls....lack of eye relief.
The NPL's at those fl's are a cheaper but good alternative.
Do you wear glasses?
Matt