I was wondering how hard it is to get into Harvard EA versus RD. I don't think I have a stellar chance for any, but I would like to maximize my chances as much as possible. Any input is greatly appreciated

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Also, chances?
Background: female, Romanian, immigrant, from Arizona (lol, if those help at all), large public school
Rank: top 10% (but kind of low rank because I moved and none of my credits transferred from 9th grade (btw, rank is 46/700+))
SAT: 2270 (800M, 730CR, 740W)
SAT II: 800 IIC, 730 Physics, and I'll take Chemistry and maybe U.S. History in October
ACT: never taken (should I take it?)
E.C: Math Club treasurer (11th), hopefully starting Mu Alpha Theta next year, tennis team and club treasurer (10th-11th), online math tutor, volunteer at a place for underpriviliged children (I just started, so I only have like 12 hours), on a city youth commission, other small leadership positions
I suck at competitions
AMC 12B: 119.5
AIME:4
a few small math awards
a few small writing awards (mostly essay contests), nothing major, though.
Research in bioinformatics, ISEF finalist 2006 (with a team project). Our mentor thinks our project is good enough to publish. Also, we got in touch with a prominent researcher in our field and she wants to collaborate, so that might be a plus.
Attended PROMYS 2005
Attending RSI 2006 - major hook, I guess
I feel like I'm missing some things, but if I can't think of what, I suppose they're not important

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Assuming pretty good essays and at least one amazing rec, what should I expect for EA (and more importantly, how would that compare with RD)?