The powered respirators are pretty good, and 3M produce some excellent gear (I used their cartridge full-face respirators when cleaning out a large pressure treatment tank prior to dis-assembly)... If money was no object sundstorm are even better (in terms of user comfort, the protection is controlled by the relevant standards I hasten to add), but they don't represent the same level of value for money.
However, if you have a suitable oil free compressor available (producing between 2.5 and 8 bar continuously) then an airline fed system would be cheaper and give an unlimited working time...
Looking at the 3M offerings on Arco's website, the cost of a Lightweight Headtop (~£40), Breathing Hose (~£30), and Regulator (just shy of £200) comes to about £270... A powered one is going to be: Lightweight Headtop (~£40), Breathing Hose (~£30), Battery and Charger (just over £110), Powered Filter Unit (~£230) and Filters (~£10 a time) for a grand total of £420... by which time you might as well plump for the complete system pack at £490 and get an extra battery and a nicer headtop.
If you use air-tools, you can also connect them to the auxilliary port on the regulator unit, eliminating the need for more than one airline.
This said, if you want to explore using mainly hand-tool methods, and have effective extraction on any larger tools you'd use for dimensioning, then little more than a good dust mask and scrupulous clean up of any fine dust produced would be adequate. You may just find handwork revolutionises the way you work with wood to boot!