Thruxton 900 Fork Oil Recommendations

I just bought this 2014 Thruxton with no owners manual and I'm wanting to bring all fluids and maintenance up to date. Bike only has 5200 miles, so I changed oil and filter, looks like PO changed air filter and spark plugs. Bike runs tits! I want to change fork oil, maybe go a little heavier. I'm aggressive rider on the street and love the corners, also might consider Ohlins cartridge up front to match the TX36 in the rear. What weight and brand do y'all recommend?