HG612s used to be available for less than the price of a cheap pint, but they are up in the £10+ range now.
If you are below the max for your package, which it seems you are at 70mbps on an 80 plan, then a VMGxxxx-B10A could net you a higher sync than a HG612.
VMG8324-B10As can still be found (relatively) cheaply on ebay, so thats what I would recommend. Just watch the auction site for a while and swoop.
But I'm biased as they have firmware source available and are fun to mess with.