Cartridge Recommendations for my Lp12

Hi people, I am building an LP12 for myself & need some advice. My LP12 S/N 65572 has reinforced corners on plinth, Cirkus Bearing, Cetech Sub-chassis, Mose/Hercules II PSU, Trampolin I, updated SS top plate with wielded bolt by the motor, Ekos II TA, latest 5 core armboard and T-Kable so far. I don't have a cartridge & I am really hesitant to spend big bucks on a Linn Akiva if there is anything better for less money. My amp is a Sugden A48 Mk III, with MM phono stage. My speakers are Spica TC 50s. I am considering replacement of the Amp and also considering the purchase of a high-end MM/MC phono preamp. Except for the TT, I am the original (first) owner of the above equipment. Suggestions on cartridges, phono preamps, even great pre & power amps would be greatfully appreciated. FYI, considering the likes of Bryston, Conrad Johnson, Jadis, and possibly Manley so far. I have ruled-out Sugden and am beginning to rule out Linn because after 2 weeks, neither firm has responded to my request for product recommendations or upgrade paths. My assumption is that if they fail to respond, then this is what I can expect if I have a major issue. For instance, my Sugden was defective when new, the retailer went bankrupt a month after I got it and it eventually cost me over $480 to have over a dozen cold solder joints repaired although still under warranty. I am only interested in products you know from experience the factory stands behind and will be there to help me. I don't mind paying for what I get, including service, but I just don't want to be left out in the cold like Sugden did to me. Thanks guys and gals, Rick