best custom roms ?

[fixxxer2012]

i have a sprint htc touch pda and i just installed the new official sprint 6.1 rom. i have been searching the forums here and i see soo many different ones. i really wanted to get my phone to look like the iphone but the current themes out there take up to many system resources. i found a rom online and id love to get my touch to look like this.... " see attached photo "

also i keep hearing about unlocking the phone ? what are the advantages of doing that ? and would you recommend it ?

more imporatntly can you guys point me in the right direction to the rom in the photo i attached or can you recommend any other good ones ? i assume if i do go with another custom rom i will loose the new sprint 6.1 rom ? is that a wise choice ? sorry for all the questions but i new at this.