The cheapest way i think is to get a 96 C, should cost you only less than 500k which should increase your ovr to 97 (96.5). If not enough get a 97 bird for 200k to 300k. I would forget getting a PF right now as they are the most expensive position in the market while SG and SF are i think the cheapest where 98 cards are like 600k to 800k.
I'd go after 95 Aldridge for under 500k bc he's got +2 agility to team and maybe 96 Walton with Block boost for under 500k. Even without boost, I liked Walton better than Boogie. This 2 will raise your OVR a bit and leave you with some coins
Edit: throw in 98 Bird or Harris for under 700k and you'll have a nice upgraded lineup. If enough guys get boosted, it may get you to 98 OVR
If increasing your ovr is your priority then always begin by replacing your lowest ovr player. I'd replace cousins with a higher ovr then move him to the bench to replace 90 KD. Then move on to the next lowest ovr position.
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