As the owner of a Hercules that does over 500mW as well as several lab-style lasers and stepper/scanner displays, I have to be honest and agree with Elektrofreak to a point... There is a lot more flexibility and versatility to owning a big laser in a lab style, especially compared with non-TEC handhelds that have a duty cycle like the RPL's, etc (I have used my herc for experimentation, etc many times in lieu of a labby, but the herc has forced-air cooling, no duty cycle, external power input, etc so it's really a whole different beast)...
Trust me, you'll pop, burn, illuminate, etc just about everything for about a month (good call on the time frame) but you'll soon realize there are only so many people you can "ooh and aaah" with your big RPL safely (because let's face it, there really is no safe way to show off a 300, 400 or more mW laser except in relatively controlled conditions) - then you can spend some more money for a beam expander, etc etc but that'll wear off too eventually, so the end result is you'll either end up with a big-ass laser you hardly find a safe time and place to use, or you'll compromise safety using it as a "toy" and then god only knows where that may lead.
Big lasers are powerful, beautiful, and highly dangerous. If you are willing to accept the responsibility that goes with that, then decide which way to go. The only thing a labby cant do that a handheld can is go places it probably shouldn't be anyways. Look into a Lab-Style!