ANY time you can buy a Shure SM81 or an Audio Technica 4033 for 150 clams you should do it.
Both of these mics are a next big step in starting a mic collection. The 4040 is a nice mic also and I have no experience with the Se stuff, though I hear from people I trust that they sound very good.
As far as the Heil or the ADK's these are also quality mics. And a studio would be benefitted by having all of them on their equipment list.
As for WHAT would be next for YOU personally, you need to assess what your going to be doing the MOST of in your future recording plans in order to choose.
Mind you....one SM57 is not enough....you should have three minimum...And a very important aspect to consider is how many instruments you will be recording at one time. If you are looking at a complete drum kit , then you are going to need several mics going at a time......minimum four, unless you have a stellar recording room and then two will do. At a minimum youre going to mic a kik-Heil PR40=killer kik mic....Snare-SM57=industry standard.....overheads-two SM81's or two AT4033's.
Guitar cabinets-SM57...yeah theres 'others' but are they 'better'???
Percussion=SM81 or 4033....theres really not much either of these mics cant do well.....
Bass= Sans Amp Bass Driver.....save yourself the problems involved with trying to get a decent bass sound out of questionable equipment from the beginning....you can 'graduate' from this when you get better.
Vocals. A Hamburg and a Heil PR40 are enough to handle a LOT of vocalists without problems.
You can do a lot without a lot if you get the right stuff to begin with.