Well, Pulse is right, that is tough. I would have to steer you in a different direction though. ISOMs accel at the Corona and Petite Corona sizes and I would think they would be a good place for you to start. I'm from the world of N/Cs where 52 guages from CAO or Perdomo are common. Down on the "Little Island that Could", the thought that a cigars flavor is most pure around the 42 guage is pretty normal.
I've heard on numerous occasions that this guage is what is rolled when the blenders are coming up with the original recipe for the cigar. It gives a very pure, well rounded impression on the palette that will win you over even if you've never enjoyed smaller cigars before. Plus, another reason I suggest them is for finances. Good Petite Coronas can be found for under $120 where as many of the benchmark Cuban Robustos will run over $160. To me, if you're trying to sample flavors, this can be accomplished with the thinner, cheaper size without sacrificing anything.
Now, the only thing to consider is whether or not the larger cigars blend your looking to try is available in a smaller size. For example PSD4s are a robusto thats blend is not available smaller. Same goes with the Epi2 you listed in your post. No PC available (that I know of anyways, though I haven't sampled all that Hoyo offers) to mimic those flavors.
Keep in mind that each size and vitola has it's own characteristics so just because the profile is available in a smaller/larger size doesn't mean it will be identicle to another cigar in the line. Similiar (enough to give you an impression of what to expect) but not identicle by any stretch of the means.
If you'd like a small sampler of PCs from the aformentioned '...Island that could', PM me, I'll hook you up and throw in a few other things just to get you started down the proper path.
