I'll try to give some guidance. These are actually pretty unusual requirements. 95% of power supplies are sub 30v and 99% of DMM's are single channel. You didn't talk at all about your application or any detailed needs. Future proofing can be lead to compromises and who know about the future.
Some Questions for you to ponder-
1. On the DMM. Resolution and accuracy requirements- how many digits basically and basic accuracy?. Long term accuracy might be important if you doing things like logging- most DMM's in electronics are used for single measurements. Is it all just DC volts? Generally pretty easy. Besides volts, what other parameters do you want to measure? Environment- lab only or sheltered outdoors, etc. Type of computer interface- options are IEEE-488- legacy but still very popular and well supported, USB- point to point, Ethernet- growing and RS-232- legacy and shrinking. USB or ethernet are probably preffered- USB must be isolated.
2. For your DMM needs, you might want to consider a solid single channel benchtop instrument like the Sigilent and a Data Logger for you multichannel needs. The 100V Sigilent might be a good bet if you get a little inventive. The HV input spec might be tough to meet but you could make or buy a 10/1 divider for those cases over 100v. A DC divider is just a pair of good resistors- ac is a bit more complex, but not bad. Any EE grad student should be able to whip something up for a case of beer.
3. On the power supply- you'll probably want two power supplies. A grunty 30v unit- perhaps 2A output unit. Dual output is a common requirement. If you find something you like, consider buying two. See if you really need a computer I/F, this can add cost. Also look at accuracy and resolution= its not difficult to get 10 mV of resolution- more gets expensive. Do you need current limiting, how precises? Think about how much noise you can tolerate on the outputs. What are you powering? Switching supplies are smaller and more powerful for the money but are a bit noisier. Linear supplies are quiet but get bulky over about 100W (30v 3a, etc).
4. On the HVPS, decide how much current you need. Only 100 mA at 500v is 50W- this is also a potentially dangerous piece of gear- a few mA at 500v is enough to get a lethal shock. Go through your needs as above. There is much less selection. Consider looking around for something used or from another department, etc.
5. Save some of your budget for test leads and interconnect stuff and possibly software to automate things. The meter will come with basic leads but consider buying an assortment of pomona banana to banana leads in red and black and maybe green and yellow at 1 meter and 2 meter lengths, these can be a bit expensive ($25/pair). Get some alligator and other connector assemblies compatible with standard bananas (4 mm) Get a quality power strip with surge and some filtering. Cabling for your computer interface- hubs, switches, etc.
Good luck. We can iterate some if you have questions- I'm sure others will chime in now that I've broken the ice.