15 and 20mm GSO Superviews and a 2 x Barlow. the 20 SV gives about the same fov as a 25mm Plossl. With that combo you'll have 20-15-10 & 7.5, a nice useful range for reasonable prices. I started with the two SV's and they are still my most used EP's.
My first scope only cost $50 and the EPs totalled about double that, still a good buy.
And although I tend to agree with Malcolms comment re Barlows above it's still handy and sometimes is usefull to unscrew the lens and use it as an extender. And it will give you some options to consider for your next EP purchase ..
