The figures I've seen
for handango are;
They take 50% if you sell less than 250,000 USD, 40% for 250,000 to 1,000,000 USD, and 30% beyond that (yes, thats right.... 50% up to two hundred and fifty thousand dollars!!!).
Further to that, if you're a non-US developer you could be looking at a 30% withholding due to IRS rules
(This could also apply to slideme as they appear to be a US company).
If you have your own PayPal account you can always use AndAppStore.com
which uses your account directly for payments related to your app instead of holding on to it, taking a cut for payment processing and reseller tax charges, and then passing it on.