I would like to apply to contest with my client as well.
.NXT (dotNXT)
It's pure .NET based client (yeah - no java required on Windows).
Planned release to public: 19 Jan 2014.
Supported features:
- Send Money, view your transactions.
- Register alias, browse aliases
- Forging (the transparent one as well)
- Hallmark checks
- Multiple accounts at 1 window
Currently known issues:
- Can not run as node
- Orphaned chains are not displayed correctly
Here are some screenshots that I just made

Accounts view:

Unconfirmed transactions:

Blocks:

Peers:

Aliases: TBD
and he working fine but when I try your program I can't add any address no existing and no new so for me this is some bug - I try to add from unlock button.