I'm actually new to hosting as well. I'm wondering why you recommended a Reseller account over a shared account. What performance advantages does this give? Do Reseller accounts generally provide more CPU time?
We host a very busy Wiki, hrwiki.org, which has grown over the past two years from running on a small reseller plan to a dedicated server. When they were running on a reseller plan the site did well up to about 150GB of traffic at which point we made a recommendation to move to a dedicated system primarily because their traffic was still increasing 25% or more each month. I bring this up because I would recommend you look at your traffic trend before you decide. If it is relatively flat at 100GB a good reseller plan or VPS will serve you well but if your traffic is increasing steadily and is currenlty at 100GB you would probably be better off to look into a dedicated server now, preferably one that will allow you to scale-up the server by adding additional Hard Drives, RAM and CPU's later.
Due to the growing amount of traffic, I would recommend either VPS or a dedicated server. If you believe you forum will continue to grow in size, you will probably end up upgrading from a reseller account to one of these anyway. You should start looking around the offers section and pick out three or four different hosts. Then look around or ask for some reviews of those hosting companies, and choose one you like.
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I signed a VPS in iFastHoting.com.
15GB HD, 200GB Traffic
Now we are running a CentOS with Apache 2, PHP 4.3 and Mysql 4.0.
I tried some other hosts before, like VeggieHost.. But I got an error when signing. So I sent an email to their support.. And until now (more than 5 days), I GOT NO ANSWERS! I'm happy that I coudn't sign with them..... If they don't anwser sales... what think about support?! =P
Anyway, my forum is not online yet.
Tomorow we will buy a Perpetual invision Licence (180 dollars ¬¬..) and set up the forum again! \o/
Well, in some weeks I will back here to tell you about the iFastHosting and the forum... etc etc.