If you really want to take advantage of iOS and the great musical apps, you can just buy an iPod Touch for 200$ (or cheaper 2nd hand).
I can understand why you prefer Android over iOS for day to day smartphone use in a Windows environment. But if it's only for musical apps you don't even need a PC to get everything working.
An iPad would be even better, if you're willing to spend the cash.. But once you grab a few cool apps, you'll forget the price you paid for an iPad in no time.
Korg iMS-20, iElectribe, Animoog, Reactable, Amplitube.. are just a few apps that really make your iPad worth it's money.. Especially with peripherals like the IK Multimedia iRig and iRig midi..Or even the Korg MS-20 controller and the camera connection kit for iMS-20
And an iPad can also run iPhone/iPod Touch apps.. So Korg's iElectribe can also be played on the iPad
I've been using my wife's iPad 1 for a long time, but she recently sold it. I'm saving for the new iPad for myself now, because i know it's worth the investment. Too bad that Applestores only fill up their iPads with stupid games for potential buyers, musicians really can't see the great use for an iOS-device until they've tried it theirselves.
I know better tablets/phones for e-mailing and browsing, but musicwise iOS is (and will probably stay for a while) the go-to mobile OS.