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I know the web3 beta version way to create a contract is

var myContract = new web3.eth.Contract([abi], 'createAtAddress'});

However, I want to use a stable version of web3 and I've been using

var web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));

var myContract = web3.eth.contract([abi])
var contractInstance = myContract.at('0x486351a2b3f3f63c04aeec19281cc7293cab8337');

However with this, I can only interact with a preexisting contract. How can I create a new contract at a certain address?

The docs say

var contractInstance = MyContract.new({from: 'createAtAddress, gas: 1000000});

but for some reason that doesn't work.

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You are missing the data part when calling new. So the actual code of the contract is not known when you try to create the contract. Try this:

var contractInstance = MyContract.new({from: 'createAtAddress, gas: 1000000, data: contractcode});

where contractcode ist the hex string containing the opcodes of your contract code that is returned after compiling.

See also the JavaScript-API documentation

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