If you like SP1, don't think you'll like RE0 coz it's said to be kinda lack of bass. Atrio perhaps?

Personally, PL-11 cause it's the only one I own and can vouch for. Try to stretch a bit for the PL-21s if you can. If not the 11s are fine.

Though, if the Hippo Booms sound like what they look like (rebranded Bijous), those aren't half bad too. But they're cheaper so I wonder if this is anywhere near true (plus if you need them in a hurry, both bro Wala and Yuheng is out in Australia, last I heard).

On the list, stay away from the EP-630, last I heard they were really boomy. Try the EP-830 instead, (again) if you can stretch a tad. Sounds a lot better (relatively) for an extra 20 bucks (then again, so does the PL-21s vs the PL-11s)

Myself waiting for bro Wala and Yuheng to get back, need new foam tips for my SP1 (my new favourite baby - bass is getting tighter by the day ), the medium olive clones are starting to hurt my ears...