TheReveller, if you want to keep your IM client simple, use 6.2, but if you want some bloated features such as winks, nudges, etc., use 7.0.
7.0 has a nice interface for the contact list, imo.
As for bugs, some people have some problems with running 7.0 final. Some even prefer to use the first beta, because they encounter less problems with 7.0.
So, why not give you a try and decide which one best for you?
PS: Plus has a neat feature for 7.0.
You can give colors to your contacts' names in the contact list.
Edit:
7.0 eats more memory than 6.2 does.
If that's okay for you, ...
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