As the above commenters mention, a large genome is not going to be assembled well with just paired end short read data. You'll need a good set of mate paired aka long jumping distance reads to go with it if you stick with Illumina.
However I would really recommend a long read library and going for a hybrid assembly. Nanopore will give you very long reads, why not ask for pricing from a GridIon or Promethion service provider. Try to get the longest reads you can, you won't regret it.
Finally, for short read assemblies I recommend Soapdenovo - installable via bioconda - for fast and decent assemblies. You'll probably need a lot of RAM (256 - 512 GB ?).
Make sure you follow h.mon's advice above too.
Best of luck.