Armitage scored tries in the quarter-final win over defending champions Harlequins and the semi-final victory against Stade Français Paris and was also named Amlin Man of the Match in the first of those encounters.
Toulon have already qualified for next season's Heineken Cup but, after losing to Cardiff Blues in the 2010 final, winning a European title and trophy is their burning desire.
"Ever since I arrived here I have been aware that Toulon have been waiting a long time for this and being in the Amlin Challenge Cup Final means the world to them," said Armitage, who was born in San Fernando, Trinidad, but grew up in the South of France where he and his brothers played for Rugby Nice Côte d'Azur Université-Racing.
"It also means a lot to me as I have never won anything either so it is going to be a huge game.
"Both clubs have so much to play for in the final. We have not won a cup for years so we are really fired up for that and we will be dangerous because we know we have to win something this season.
"Biarritz have to win to get into next season's Heineken Cup so it is going to be a really tough and interesting game - one I am really looking forward to.
"We obviously know each other pretty well from our Top 14 games but the way of Toulon is that it is just a different name on the jersey and we play whoever is there on the day.
"Biarritz have got quality players right through their team and they have got a lot of internationals so every one of their players will be a threat on the day.
"Scrum-half Dimitri Yachvili is their game changer, Damien Traille is very strong under the high ball and Magnus Lund, who I know really well, is a great player. With players like Imanol Harinordoquy, Benoit Guyot and Raphael Lakafia they have got a really strong back row and it is a match-up I am really looking forward to hopefully being a part of.
"We are not scared of anyone and on our day we have got the players to win games so the only important thing to Toulon was that we were there for the final and not who we are playing.
"A lot of London Irish supporters are going to the final - and others will go to see Jonny (Wilkinson) and other English players - but it seems the whole of Toulon is getting ready to invade London."
Bernard Laporte, the former France coach, is now at Toulon's coaching helm and Armitage has been impressed by his new boss.
"Bernard has brought his own distinctive game plan with him," added Armitage, "and although Toulon are regarded as big spenders, he also makes sure that everyone keeps their feet on the ground and everyone is equal.
"He has given players the opportunity to come out of their shells and play their own kind of rugby while keeping to his game plan which works pretty well for everyone.
"I moved to Toulon to get back my love of playing rugby and there is no pressure on me, I can just concentrate on my own game and playing with some really great guys gives you the extra incentive.
"Toulon are the type of club where if you are not playing well there are always others to come in so you know you really have to work hard to keep your place.
"I believe I am learning with every game - and with so many great flankers at the club you have to perform week in and week out to keep your spot."