I wonder if it is indeed worth the $300. I always use a simple syntax highlighting editor, and do the rest myself (yes, even the HTML!). I find that thinking a little in advance might save you a lot of time already. Also I stick to the rule "one SQL query per page load" and you don't need more (times, that is). If you don't put megabytes of data in your dbase per time you open it, it won't get significantly slow.
Only debugging is a little slow, but I strive not to put in bugs in the first place