I need to replace my strings. I currently have obligatos and I see no reason to change.

Just have a couple of questions.

what is the difference between goldplated and steel E strings?

I am buying the strings online and they come loose or packeted. Loose is cheaper but will they be marked in any way so I know which is which?

Gold plated should sound warmer, a little more mellow.

I always buy loose strings (from the Stringzone) - they do come with a label on the little plastic bag telling you which colour is which string.

like jessy said, loose ones come with a label telling you which one is which
I only ever used the gold E from obligato so can't tell you about the other I'm afraid

...and the gold ones look prettier too!

I've fairly recently swapped to a gold - Oliv gold - and I do prefer the sound, and the feel under my fingers, maybe a little less like cheese wire?!
It will specify on the packet.

Strings have been ordered. Loose with goldplated ball end E string.

Which online site sells loose strings please

I've only ever had them come in packets.

The String Zone.

also here:
http://www.violinstringshop.com/pirastro-o...cial-offer.html
I have bought mine from them and have been VERY pleased with their very fast delivery and service

ps the link I provided is for the 'violin set' but you can buy strings one by one and for viola too of course... (or cello)