chacha is better spec! with 3G & front camera..

believe me, choose blackberry if u utilize the Blackberry apps such as BBM , surfing , FB, twitter , fb messenger , twitter , email , and other apps..

if not.. better don't choose blackberry..
you just need to subscribe BIS for as low as RM20[the recommended package, there are cheaper package.. but not recommended] ... , this Hotlink BIS Bonus 20 is RM20 per month , usage = if u use Blackberry apps that use BIS connection , it is unlimited[tested by myself] , 100MB data quota is for the other usage[I also dont know what usage.. because I have download more than 100MB and the credit not deducted]...
streaming,wap ,tethering isn't included in the package..
curve 8520 is good , the other option is Used/refurbished Bold 9000 /  Used Bold 9700

So, do you really need a blackberry..?

if yes.. just go with Blackberry 

So, just go for HTC Cha Cha    ,
you have made your choice clearly there...

don't need to use blackberry if u not fully utilise the Blackberry,
there are many better phone[in term of spec] than the Curve 8520 ,

go for HTC Cha Cha 

for colour, you need to choose yourself, 

Black look elegant,
Purple looks like fancy and suitable for girl..

welcome, I suggest u need to see your phone yourself.. 

depend, i would suggest u to just buy new one - around RM650++ ORI

but if u can get nice 2nd hand set also can..

*actually its up to you ..

Lol you are funny..
Of course its up to you

I'm just state my opinion..., and as i stated before.. If you can get nice 2nd hand set also good too..

I suggest you buy the 2nd hand set that still has warranty left.. Make sure u buy the original brightstar set of HTC ChaCha, Make sure you have the warranty card...
If ask about the chacha itself, sorry i dont know how to check that properly...