I am looking at getting a CZ455. My fist thought is to get the MPA 22BA as I use a MPA chassis for PRS. Is the MPA built gun with the extra money compared to getting a 455 varmint precision trainer?
I would also get the cheapest 455 Varmint you can find and drop it in a chassis. I went through this same dilemma over the past month. I actually got the Tacticool for $434 with the intention of pillar and bedding it which I did. Shot decent out of the box, huge improvement bedded and now in a MDT LSS-22 chassis. Shooting submoa at 100yds with FGMM and 5x15 at 50yd with various types of match ammo is 0.50 agg.
Shoot your barrel first before immediately getting a Lilja. I was going to go that route but my factory barrel is shooting damn good.
http://www.snipershide.com/shooting/threads/mdt-lss-22-chassis-review-cz-455-22lr.6904025/