Android - Proper PC Suite for android?

That's the beauty of Android. You don't need a separate piece of software for your PC. It's designed from the ground up to do everything within the Cloud.

• manage my phone files (audio/photo),

Connect via USB, turn on USB drive mode, and use Windows Explorer to manage your files.

• calendar (ms outlook independent)

Sync over-the-air (OTA) to Google Calendar.

• add/remove applications,

You do that right on the device or in the Google Play Store.

• access/edit/merge/remove contacts (ms outlook independent)

Sync OTA with Google Contacts.

• send SMS messages

There are some apps that allow you to do that.

If you're looking for an app that behaves like the Suites of yesteryear ;-), try MyPhoneExplorer. Here's a short list of features:

Features:

• Addressbook - with direct sync to Outlook, GMail, Windows contacts, Thunderbird, SeaMonkey, Lotus Notes and Tobit David
• Organizer with calendarview and direct sync to Outlook, Google, Sunbird, Thunderbird, SeaMonkey, Windows calendar(Vista), Rainlendar, Lotus Notes, Tobit David and net shared calendars (WebDAV, FTP, local)
• SMS - archive, export, import, excessive messages,...
• Filebrowser with cachesystem to minimize datatransfer, automatic photosync...
• Set phoneclock based on atomtime
• and much more. such as : calllists, edit profiles, control phone, memorystatus, phonemonitor,...

Desktop Apps

1. PandaApp PC Suite

   This is a full fledge PC Suite for android (much like nokia pc suite). And has interface better the myphoneexplorer

   It has all features you need.
   File manager,
   Sms Manager
   Screen Capture
   Application Installer
   etc..

   

2. Hi Suit This is for Huawei IDEOS phones, I don't know if it can work with other phones as well.
   It can be downloaded from Huawei IDEOS page, link Direct Link
   

3. HiAPK PC Suit

   

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Webapps

AirDroid

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This link lists 10 good PC Suites for Android.