That's too much work for the average person who plans to spend only a few bucks month. I mean, really, its not like buying a computer.
When in doubt choose a large hosting company that has been around for years to get your process going. Then learn from managing your own site what would be a good host for you. Keep in mind that shared hosting is a commodity and there is not much difference between one host and another. If your web site size is 1 GB it makes no difference if you go with a host with a 3 GB plan or a host with a 5 Gb plan. Similarly with bandwidth, email accounts, etc.
As a matter of fact, disk space and bw should not even enter into the decision making process. Thus do yourself a favor and keep it simple by narrowing your choices to hosts that do not use a bunch of hosting plans based on a confusing array of hosting quotas. Concentrate on other factors instead of trying to compare a dozen confusing plans from a couple hosts