The Holy Grail of GTD systems

Every few months I have a look around to see what new developments there have been on the GTD software front.  I'm currently using Toodledo ( the Pro Plus subscription is good value, allows file attachments and has iPad and Android apps) but it is not perfect.  The ideal GTD system would have:

• Ability to attach files and link to cloud file storage from Dropbox, Box.net, Sugarsync etc;
• Evernote integration - Nozbe sort of does this but it is not a true 2-way integration;
• Recurring tasks - it can't be that difficult;
• Email in facility;
• Integration with Google Calendar;
• Native apps for Android and iPad - those are the 2 mobile systems I use;
• Contact integration - this is the missing link for most systems - Insightly offers this but currently has no iOS or Android App and the paid subscriptions are too expensive for solo workers;
• Reasonable pricing - Toodledo offers good value but others are either too expensive or have not yet introduced a pricing scheme which puts me off investing time in what might become a pricey solution.  $5 a month is about my limit for something that would do all the above.

Am I being unrealistic?  What would you add to the list above?  Is there something already out there that meets my needs?