I think that tor is a good choice so far. If your ISP keep hostile and start to filtering bitcoin protocol in its network, they can't stop the tor (if they block tor, you can use a bridge to connect to then). But I like Mesh network, probably in a local way this is even possible, creating a "cloud" that makes more difficult to track any specific transaction source, with a redoundant system of connections to others network (connecting to more than one network) may reduce the chance of attack. 
Also, I really think that the ISP is a real problem, since the data on bitcoin network are transmitted without encryption (correct me if I'm wrong), if a transaction comes out form your node without comes in previously, it can deduce that the transaction belong to you. This problem is also solved with tor.