There are a lot of disconnects with your statement.
20" rims on 35's don't look bad at all IMO. But when you say you are street riding only....what is the point of a 2.5" lift? I'm assuming you are going up in wheel size because a 2.5" lift with 20" rims that will result in 55 series tires (to stay at 32 inches) is going to look......well.....silly. But if you are street riding only....there is no point in gong up in wheel size....so I'm assuming you are not going to 35's.
You see the conundrum?
I'm a mall crawler, not an off-roader.....so my advice to you would be to stay stock for multiple reasons. There is no need to spin $3000-$5000 on a lift, rims, and tires (and maybe a new tire carrier, a re-gear, and all the other stuff that comes with lifts and heavy wheels) just to drive to Starbucks.
At a minimum, skip the lift, and don't go higher than 18" rims if you will be street only.
Jeep - It's a Jeep thing...you wouldn't understand.
Triumph - Go your own way.
I see why I'm a loner....and I love it!