Don't know what to choose from......

Let me see... Do I really need a new mobile phone? Now I am using :

1. HTC Diamond 1
2. HTC S 740
3. CDMA C700

I have a eye on the Samsung Galaxy Tab 3G Wifi and the HTC Flyer. Will it replaces my 'hogging' the XPS 1210 everywhere that I go?

Will my HTC S740 will be enough for my basic email from the company intranet?