You might just get away with a 350...I think I had it going alright on me old AMD K6-2 333.
There are loads of track missions with 1.5 that were provided by various luminaries of the online community. One of which reminded me of your SU27 SEAD antics a little.
A player set up a ring of Tor units an approached above their max engagement altitude, then dipped down and picked each one off, just nipping up to a safe altitude again with a load of missiles detonating below him each time, I however was not able to repeat the task myself without being blown up :icon_redf
Flanker always got a lot of stick for 'crude' graphics, but the individual units (Tunguska, Tor, S-300 rigs, Surface vessels) were well, well ahead of the competition in terms of sheer detail. In fact I don't think they were beaten until Flanker 2.0 came along.
The event log detailed every shot fired as well, something I do miss. Could make heavy reading sometimes, but it was always interesting.
I'm really tempted to redo some of the General missions in Lomac, not least because I think they'd pan out really nicely, and I think the AI and detailed threat modelling could make them work now (all friendly units would just get mashed by SAM or the GAI assets in the original...same in 2.51!)
An interesting problem was the placement of some of the units...because of the more detailed crimea some have to be displaced a little, as the original coordinates would have them on city blocks or lakes!