hi there!!

the answers:

1) depends.... my favorite is HD7 but I ended up getting Mozart cos the price is really attracting with ORIGINAL warranty somemore... if budget and time is not your concern, by all means waiting for HTC Titan... will most likely available in October or November. However, considering that it is your wife who will be using it, I would suggest Mozart for its looks and size... not much lady I know likes big phone

2) Current OS is still not available to run multitasking... imagine it is like iPhone 3GS back then where when you close the app, it is closed... but fear not.... Mango update will bring multitasking function back, which should be arrived in just a week or so (hopefully)

3) Nope for me... even if you did feel the sluggish interface, it is due to the app poor coding... however do take note that there are some Mozart users responding that their Mozart's screen is not responsive... I experienced once before... but restarting the phone solved the problem...

4) yes, there are some apps help to input chinese characters.... but very troublesome... then again, heard that upcoming Mango updates will have chinese language pack pre-installed... so this should not be a problem once Mango hits the shore..

hope this helps