Army: Bobcat APC (cancelled in '63 IOTL) is given more time to work out its teething problems and is introduced into service by '68. Centurions are upgraded, since the budget probably doesn't have room for Chieftains.
The Bobcat would be excellent, though its smaller than the M113 and has a few flaws in its design. The Centurions should get the upgrades the Israelis did with theirs. I would still use the M113 alongside it in a few roles, though.
Navy: homebuilt DDGs/FFGs, something is done about the Bonnie. Perhaps the Eagle or a CVS with Harriers in the 1980s?
Homebuilt DDGs might be good, but in this case it might be better just to buy a variant of the American Charles F. Adams class, or wait until the mid to late 70s and order the Kidd class destroyers. Homebuilt FFGs is even harder, because the first real FFGs of the USN were the Perry class. One could easily enough take the design, give it the wider beam of the Spanish Perrys and a longer rear to allow the use of the Sea King. And if you do these, you'd likely end up scrapping the Halifax class.
As the Bonnie, she could still work for a few more years. Eagle is an option (one which I used myself

) but that ship is quite old. Might be better to buy into the Invincible class development, or maybe even junk the Bonnie a year earlier than OTL and buy HMS Victorious off the disposal list. (Fitted with A-4 Skyhawks and Buccaneers as well as the Trackers and Sea Kings, this ship would have a fair punch indeed.) If you buy into the Invincibles plan, one could easily see at least two of those for the MARCOM.
Political elements might also play here - CF Morale, particularly in the Maritime Command, went absolutely into the shitter in the 1968-1970. Announcing the unification and then saying "Guys, a unified force means you guys have to able to support our ground guys, and we're getting you good ships and airplanes to do it" would probably help this. Refitting or fixing stuff could be passed politically as a way of reducing unemployment, which was a major problem in late 1960s/early 1970s Canada.
Air Force: In 1969 AIRCOM recommended Rhinos to replace the elderly Voodoos, promptly axed by PET. Without him in office, the purchase goes through. KC-130s for AAR, maybe a 707 or 2 for AWACS. I would also recommend Chinooks and Hueys for air mobility, you don't need gunships.
Buying the F-4 in 1969 is dumb if you ask me. By that time, it was well known that the F-14 and F-15 were on the drawing board. Hang on to the Voodoos and Starfighters for a few years and buy the Eagle or Tomcat to replace them. If you need lighter-weight fighters with air-to-ground capability, buy the F-16, Mirage F1 or Tornado in the mid to late 70s. I would only clear the Rhino if you could get them for cheap. Otherwise, save the cash and buy the good stuff in a few years.
KC-130s don't work worth a shit for air-to-air refueling of jets, which Canada knows now, because they simply are too slow. The best way here is to get a few KC-135s specifically for the goal or get yourself a number of 707s or similar airplanes (ex-RAF Comets, or former civilian VC10s, DC-8s or Comets) for the air-to-air refueling job. Buying 707s in number in the 70s makes the most sense - four AWACS birds, six to eight refueling tankers and two VIP planes would all work well.
The Chinook is a given - its the best at its job out there, though with a smaller payload than the Sea Stallion. (The Chinook, however, is faster and climbs quicker.) The Twin Huey entered CF service in the early 70s in any case, and for transport duties something with a bit more beans is preferable. The Twin Huey does that well, though the Aerospatiale Puma would also work nicely.