4.0 Should i use 3.?

[b0re]

Hay,

I am new to I.P.B i own forum with around 1500 users and around 14k posts its a active forum and grown well i am using PBPBB.

I am going to create a new forum and migrate the data over.

I have the 2 questions -

1. Should i build in now in 3. or should i wait for 4.0.  I do not want to spend months moving and creating a custom design then having to re do on 4.0
2. I want to have a front end website for the forum.  I see 2 options use the content mod (Not really liking the design)  or to use some blog software for the front end.

Any tips are helpful

Thanks