https://www.metastock.com/products/realtime/
$1395 one off payment or $100 a month for r/t plus $150 a month for Reuters Eikon/metastock xenith is the same price as esignal. Have you tried version 12 of esignal? Very smooth and will let you send orders to your broker. Not sure if it has a DOM though.
Edit: Esignal does have a market depth addon http://www.esignal.com/trading-blog/addons/market-depth/
What platforms does your broker offer?
Can you even still get v12?? v15 is the most recent.
I don't trade through eSignal. When I started with them they didn't have charts or broker links. Back then we used eSignal for data only and other 3rd party trading apps. I still do that. I use Rithmic for ES DOM trading and Fidelity ATP for other.
I've used eSignal for so long, I'm grandfathered at a better rate. eSig told me that if I ever did not renew, I'd lose that rate and wouldn't be able to get it again if I came back to them.