hi david, if your anything like me its worth taking what i would considder the easy route and keep an eye on the chips, you will soon get a feel for what a good "chip" is
so your eaither tuning feed or speed based on chip quality

aluminium can be a bitch if its "gummy" in which case WD40 and patience is probably the way to go (a lot of chip re-cutting and can bog down no matter what feed/speed)
if the aluminium is coming away much more cleanly then id just keep an eye on those... idealy you want a nice consistant chip with a bit of weight (thicker than tin foil!!)

at 2000rpm, single flute carbide my feed would be closer to 200mm/300mm depending on what the chips look like
if your tool has more flutes your speed needs to be a bit higher than 150mm.... maybe 300mm plus
be brave and be prepared to lose a tool :).... it may be worth having a look at the single flute carbides (ebay) nice n cheap and work well in all sorts of materials

I know I've cut myself on them all to easily whilst getting parts of the bed etc.
join the club :)