Best mw2 class setups?

I am 5th prestige lvl 30, i play mainly Search and Destroy, domination/demolition, team deathmatch and free-for-all. i’m just getting bored with my regular class setups and am looking for new guns to use. I am a pretty versitile player. I dont tend to rush much anymore as i am trying to get a nuke…my class setups are

M4 with grenade launcher/red dot sight
Akimbo G18s
semtex/throwing knife and stunners

sleight of hand/scavenger(if im going for nuke)
stopping power/hardline(nuke)
steady aim/ninja(nuke)

mp5k red dot sight/ump45 silencer
whichever pistol i have with tactical knife

marathon
lightweight
commando

(Favorite class)
Intervention fmj
Akimbo g18s

sleight of hand
stopping power
ninja/steady aim

other 5 classes are usually variations on my assault rifle class.

I am just looking for your opinions on my classes and what you use and think i should try. also if yyou have any tactics to help me with getting a nuke…i usually either take one part of the map and own it(free for all) or find a spot, get a couple kills and move to the next.
feel free to tell me a high level gun that i havent unlocked yet because i play alot of SnD and its like 1000 points a kill right now, 2000 for a headshot so i level up constantly…