Former All Black Brad Thorn's rebuild of the
The Reds, however, haven't won in Canberra since 2014 and will again be looking to the experience of playmaker James O'Connor to pull the strings.
Once the bad boy of Australian rugby, after a string of disciplinary problems, a more mature O'Connor has been a pivotal figure this year.
"We know what we have to do and we want to go down there and just finish it off," said O'Connor, who was also in Rennie's squad.
After being cleared of concussion, the dangerous Jordan Petaia will shift to the right wing for the Reds with Chris Feauai-Sautia ruled out with a groin injury.
It means Paisami will start at outside centre. In the forwards, JP Smith starts at loosehead prop with Harry Hoopert dropping to the bench.
McKellar, whose side made the 15-team Super Rugby semi-finals last year, sprung a surprise by picking Noah Lolesio in his starting line-up despite the 20-year-old not playing since July 18 due to injury.
Lolesio, another of Rennie's uncapped call-ups, will form a halves pairing alongside recalled Wallaby Joe Powell, with experienced scrum-half Nic White coming off the bench.
"To be able to play a home final in front of our family and our supporters is something we set out to do at the start of this competition and we can't wait for that opportunity," said McKellar.
"We've prepared well over the last two weeks and we know the Reds are going to be a huge challenge on Saturday night but it's one we're looking forward to."
15 Tom Banks, 14 Andy Muirhead, 13 Tevita Kuridrani, 12 Irae Simone, 11 Tom Wright, 10 Noah Lolesio, 9 Joe Powell, 8 Pete Samu, 7 Will Miller, 6 Lachlan McCaffrey, 5 Cadeyrn Neville, 4 Murray Douglas, 3 Allan Alaalatoa (captain), 2 Folau Fainga'a, 1 Scott Sio
Substitutes: 16 Connal McInerney, 17 James Slipper, 18 Tom Ross, 19 Nick Frost, 20 Rob Valetini, 21 Nic White, 22 Bayley Kuenzle, 23 Solomone Kata
15 Jock Campbell, 14 Jordan Petaia, 13 Hunter Paisami, 12 Hamish Stewart, 11 Filipo Daugunu, 10 James O'Connor, 9 Tate McDermott, 8 Harry Wilson, 7 Fraser McReight, 6 Liam Wright (captain), 5 Lukhan Salakaia-Loto, 4 Angus Blyth, 3 Taniela Tupou, 2 Brandon Paenga-Amosa, 1 JP Smith
Substitutes: 16 Josh Nasser, 17 Harry Hoopert, 18 Ruan Smith, 19 Tuaina Taii Tualima, 20 Angus Scott-Young, 21 Moses Sorovi, 22 Bryce Hegarty, 23 Jack Hardy