Frostwulf - for questions about German and Celtic ethnicity I found "Beyond Celts, Germans and Scythians" by Peter Wells useful. He just puts forward the case that not all what ancient Greek and Romans put forward about the northern barbarians is correct.
For your point about the Helveti - Caesar states that the Helveti wage constant war against the Germans, either repelling them from their own territories, or invading German lands. Caesar also say because of this they had the most valour of Gallic tribes. Orgetorix proposed that the Helvetti, whoes lands were confined to the mountains, move into the territory of the Aedui - to do this he married his daughter off to Dumnorix - a noble of the Aedui. He also made an alliance with the Sequani noble Casticus so he could pass through their lands. Unfortunately Orgetorix never fulfilled his ambition as he was killed, whilst Dumnorix was driven out by his brother Divitiacus, who had the backing of the Romans. I don't think Caesar mentions that the Helveti's migration was because of germanic raiding, but he does mention that they wanted better land. This is all from Caesar's Gallic Commentaries - the first few pages.
*I've edited this post because the guys below think I'm referring to Caesar's pep talk, but I'm not as I'm referring to the first few pages when Caesar's discusses the movement of the Helveti*
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