Zoom H2 - Excellent price and good reviews
Marantz PMD620 - Size, but bad reviews
Olympus LS-10 - Size, price and good reviews
H2: not the best for external mics. Internals have good reputation though.
PMD620: sturdy, I haven't heard much bad abt it. But the R09HR has a better price point.
LS-10: with the HEB, I guess you will run them with the supplied bbox and go mic-in, right? In that case it might work, although the reviews have been mixed:
http://taperssection.com/index.php/topic,105411.0.htmlJust to let you know that the line-in on the LS-10 is useless for stealthing with "our gear", since it requres a very loud signal, which most small preamps won't feed. So if you ever consider upgrading, LS1- is a dead end, unless you throw in a heavy-duty preamp (which would defeat the purpose of going stealth!). YMMV.
For those who are swayed by the tiny size of the LS-10, ask yourself if the 2-3 cm makes any difference in a real life situation! Surely, anyone can stealth an R09. Heck, I've stealthed a UA-5, H120 and mics, just last month. Use your jedi powers, and don't chicken out compromizing your gear...
I think the concensus here is to go for the R09HR. There are great bargains out at the moment. With e-coupons it can be had for less than $300, according to recent posts here.