Adidas are always a great call Light yet strong - Adidas FF80 (McCaw's Boot) Strong and good for scrummaging - Adidas Kakari (Almost every pro-forward's boot) R15 are a great option for a low price, maybe try to find 8 studs if possible for the wet games.
Asics Tigreor boots are brilliant: sturdy, reliable boots designed to increase speed. Specifically for flankers it's a perfect blend of sturdiness and speed
Kooga 8 studs. They are cheap and reliable they don't tear despite the price and the 8 studs provide much needed grip as a flanker.
Since you're a forward, you'll need to buy 8-studded boots because you'll need the grip to push and you'll also do a lot of rucking too. I suggest you buy the Adidas Flanker IV. The name itself explains it.
Preferably rugby boots
